😬 Claude Haiku 5.5 is the BEST Cheap Model Yet? But It's Not the GPT-6 Luna Killer...

Introduction

Claude Haiku 5.5 has me wondering if Anthropic is deliberately trying to crash AI prices. It's got Opus-level ambitions on what looks like a coffee budget.

The craziest part? Claude Haiku 5.5 used just 1% of the weekly usage limit on a $200/month plan. 

That's so little that I'm starting to wonder what those expensive models are charging extra for.

So, is Claude Haiku 5.5 actually a bargain, or will you save money only to lose your patience fixing its mistakes? I'll show you what happened.

I. What’s New With Claude Haiku 5.5?

Claude Haiku 5.5 is Anthropic's smallest and most affordable model in the Claude 5.5 family. It's built to handle large amounts of work at a lower cost, whether you're writing code, using computer apps, or building projects.

Anthropic's numbers suggest that this budget-friendly model can compete with much more expensive models on certain tasks. So, let's see how impressive those numbers really are.

• Low Cost: Claude Haiku 5.5 is Anthropic's budget-friendly model.

• Strong Benchmarks: 72.4% on computer use and 39.2% on Terminal-Bench 4.0.

• Higher Effort: Max effort improves performance but increases cost.

1. Benchmark Comparison

In the computer use benchmark, Claude Haiku 5.5 scored 72.4%, compared to just 15.7% for Haiku 4.5 and 48.9% for GPT-6 Luna. Sonnet 5.5 still leads at 83.9%.

The coding results are interesting too. Claude Haiku 5.5 reached 39.2% on Terminal-Bench 4.0, while Haiku 4.5 scored 0%. On FrontierCode 1.1, it scored 46.4%, slightly ahead of GPT-6 Luna at 42.4%.

That's quite a jump for a budget model. Claude Haiku 5.5 is getting surprisingly competitive in some areas, although Sonnet 5.5 still has a clear advantage overall.

2. Computer Use Performance

The second chart shows how much reasoning effort affects Claude Haiku 5.5's computer use performance.

At Low effort, Claude Haiku 5.5 scored around 42%. That climbs past 62% at High and reaches roughly 72% at Max. Of course, higher effort also means you're paying more for each attempt.

Claude Haiku 5.5 reaches its Max result at around $0.60 per attempt, while Sonnet 5.5 needs a higher cost to reach a similar score. If you're running lots of computer use tasks, that price difference could add up quickly.

3. Knowledge and Cost Efficiency

The third chart tells a similar story for real-world knowledge tasks.

On GDPval-AA v2.1, Claude Haiku 5.5 starts at around 1,130 Elo with Low effort and climbs to 1,620 Elo at Max. That's getting closer to Sonnet 5.5, although Sonnet still reaches a higher score of 1,840 Elo in the benchmark comparison.

The cost is what really caught my attention. Claude Haiku 5.5 reaches 1,620 Elo at roughly $0.80 per task, while Sonnet 5.5 costs considerably more to reach its highest score.

Still, benchmark charts only tell you so much. I'm more interested in what happens when Claude Haiku 5.5 has to build something real, deal with broken code, and figure out how to fix its own mistakes.

II. Claude Haiku 5.5 #1: Browser OS Test

I started with an ambitious challenge: building an entire operating system inside a web browser, complete with apps, games, and interactive features.

Making a desktop look nice is one thing. I wanted to know what would happen when I actually clicked around.

→ Would the apps work, or would I end up with a beautiful collection of buttons that did absolutely nothing?

1. Building a Functional Operating System

I opened Claude Code, selected Claude Haiku 5.5. Then I gave Claude Code this detailed prompt to build a complete browser-based operating system.

Build a fully functional browser-based operating system called Nova OS.

I want you to create a complete desktop experience with working applications, interactive games, and persistent storage.

This must be a functional project, not a static UI demonstration.

PROJECT REQUIREMENTS

1. Desktop Environment
- Build a Windows-style desktop with a taskbar and Start menu.
- Display the current date and time.
- Support multiple application windows that users can drag, resize, minimize, maximize, and close.
- Create a right-click context menu.
- Include several selectable wallpapers.
- Add a notification system and application launcher.

2. Built-in Applications

File Manager:
- Create, rename, move, and delete files and folders.
- Organize content into directories.
- Support basic file previews.

Notes:
- Create, edit, and save notes.
- Support basic text formatting and adjustable font sizes.
- Allow saved notes to be reopened.

Mail:
- Create a realistic inbox with sample messages.
- Allow users to read, compose, and reply to emails.
- Display notifications for new messages.
- Keep all email interactions inside the simulated environment.

Paint:
- Build a drawing canvas with brushes, shapes, and colors.
- Allow users to save drawings to the virtual file system.

Terminal:
- Create a simulated command-line interface.
- Support commands for navigating directories and managing files.

Settings:
- Allow users to change wallpapers, themes, and system preferences.
- Save preferences between browser sessions.

3. Interactive Games

Driving Game:
- Build a GTA-inspired driving environment.
- Include controllable vehicles, traffic, and police cars.
- Add collision detection and a health system.
- Support smooth keyboard controls.

Arcade Game:
- Create a playable space-themed game.
- Include movement, enemies, collisions, and visual effects.
- Add a scoring system.

4. Mood Engine
- Monitor keyboard activity, mouse movement, and idle time.
- Convert user activity into an energy value between 0 and 1.
- Make the desktop wallpaper react to changes in energy.

5. Technical Requirements
- Use a modern frontend framework suitable for browser applications.
- Keep the interface responsive.
- Use browser storage to persist settings and virtual files.
- Maintain application state when switching between windows.
- Handle errors gracefully.
- Ensure every visible button has a working function.

6. Development Process
- Inspect the project environment before implementation.
- Organize the code into reusable components.
- Implement the desktop and applications in manageable stages.
- Test each major feature.
- Fix build errors and obvious interaction problems.
- Avoid leaving unfinished placeholder features.

FINAL DELIVERABLE

Provide a working browser-based operating system that I can run locally.

Include:
- Complete source code
- Installation and startup instructions
- A summary of implemented features
- Known limitations

Prioritize working functionality, usability, and consistent behavior across the entire system.

I finally got Claude Haiku 5.5 to build a working browser-based operating system called Nova OS. I tested the features, and everything actually worked. I wasn't expecting that!

• Desktop: I could use the Start menu, change wallpapers, and manage windows.

• Apps: I tested Mail, File Manager, Notes, Paint, Terminal, and Settings without issues.

• Games: I could play both Driving Game and Space Arcade.

I also discovered a funny feature called Mood Engine. It tracks my keyboard and mouse activity to change the wallpaper. Apparently, Claude Haiku 5.5 thinks I need a computer that checks my mood while I work.

I'm pretty impressed with what this budget model managed to build.

2. Results and Output Limit Problems

The games exposed a few weaknesses in Claude Haiku 5.5. A transparent map covered the screen, and I couldn't exit the car. Apparently, Nova wanted me to live there permanently 😢😢

The retro space shooter worked better, with decent effects when the spaceship took damage. However, Paint showed a Storage full error when I tried saving a drawing.

If Claude Code hits an output limit, first check which files were saved like this:

My previous Claude Code session stopped with this error:

"response exceeded the output limit"

I need you to inspect the existing project and recover as much completed work as possible.

Follow this recovery process:

1. Inspect the Project
- List all existing project files and directories.
- Identify completed, incomplete, and missing components.
- Check package configuration and dependencies.
- Determine whether the application can currently run.

2. Verify Existing Functionality
- Run the available build and validation commands.
- Identify errors preventing the application from starting.
- Check whether the desktop, applications, and games exist.
- Preserve all working components and saved user data.

3. Create a Recovery Plan
- Summarize which features are already functional.
- Identify the most important unfinished components.
- Break the remaining work into small, independent tasks.
- Prioritize a working desktop before adding optional features.

4. Continue Development
- Resume from the last verified working state.
- Complete one component at a time.
- Test each completed component before moving forward.
- Avoid rewriting working code unnecessarily.
- Save progress after each major milestone.

5. Prevent Another Output Limit Failure
- Keep responses concise.
- Write implementation details directly into project files.
- Avoid printing large source files in the conversation.
- Stop after a meaningful milestone if the remaining work is too large.
- Explain exactly what should be done next.

IMPORTANT:
Don't assume that files from the previous session were saved.

If the project directory is empty, tell me clearly and rebuild the minimum working desktop first.

Start by inspecting the current project. Report what exists before making changes.

Luckily, Claude Haiku 5.5 had saved everything. All 36 source files were still there, the build passed, and the main features worked when I tested them.

My final result? Claude Haiku 5.5 built a working browser-based operating system with six apps, two games, and a Mood Engine.

That's pretty impressive for a budget model. I was expecting a few broken buttons, but Claude gave me an entire desktop to mess around with.

III. Claude Haiku 5.5 #2: C++ Skate Game Test

After building Nova OS, I wanted to give Claude Haiku 5.5 a tougher challenge: creating a skateboarding game in C++ without a game engine or external libraries.

I wanted to see how well Claude Haiku 5.5 could handle movement, physics, and gameplay on its own. Making a character ride a skateboard sounds manageable.

1. Building a Skateboarding Game With AI

First, set the reasoning effort to Max. This time, I asked Claude Code to build the entire game from scratch using C++, without relying on an existing game engine.

Build a complete skateboarding game in C++ without using any external dependencies or game engines.

I want a playable 3D-style skateboarding experience inspired by classic skateboarding games.

PROJECT REQUIREMENTS

1. Game Environment
- Create a skatepark or urban environment with roads, sidewalks, ramps, rails, and obstacles.
- Include buildings, pedestrians, and moving traffic.
- Add a third-person camera that follows the player.
- Create a clear HUD showing the current score and tricks.

2. Player Movement
- Support movement using WASD and arrow keys.
- Implement acceleration, braking, turning, and jumping.
- Add realistic gravity and collision detection.
- Make movement smooth and responsive.

3. Skateboarding Tricks
- Implement ollies, kickflips, and basic aerial tricks.
- Animate the skateboard separately from the character.
- Make the board rotate independently during flip tricks.
- Keep the player's feet aligned with the board when landing.
- Calculate trick scores based on difficulty and successful landings.

4. Replay System
- Record the player's recent movement and tricks.
- Press Z to activate a cinematic replay.
- Show the trick from a different camera angle.
- Display a visual trail showing the player's movement path.

5. Game Interactions
- Add pedestrians who move around the environment.
- Include traffic and basic collision reactions.
- Create wipeout animations when the player crashes.
- Add respawn behavior when the player falls into water or leaves the playable area.

6. Technical Requirements
- Use C++ and standard system libraries only.
- Do not use Unity, Unreal Engine, Godot, SDL, SFML, or external game engines.
- Keep the project organized into separate source files.
- Handle keyboard input and game rendering.
- Make sure the game can compile and run locally.

7. Quality Checks
- Test player movement and collisions.
- Verify that all tricks work correctly.
- Check that the replay system records and plays back movement.
- Fix compilation errors before finishing.

FINAL DELIVERABLE

Provide:
- Complete C++ source code
- Build and launch instructions
- A playable game
- A short list of known limitations

Work directly in the local project directory.

Don't publish, deploy, upload, or push anything to GitHub.

Claude Haiku 5.5 successfully built SkateCity, a playable 3D skateboarding game. I could ride around the city using WASD or arrow keys, perform tricks, and track my score. The game even had moving cars, pedestrians, and a speed display.

I also got a proper start screen with instructions for each trick. I could press Space to jump, F for a kickflip, Q for a shove-it, and E for a 360 spin. Pretty impressive for a game built from scratch.

Then I tried a few tricks. The skateboard moved, but the character animations looked a little stiff, especially in midair. Apparently, Claude Haiku 5.5 thinks human legs are made of wooden sticks.

The game also includes a cinematic replay system activated by pressing Z, although I haven't fully verified how well the replay works in the browser version yet.

2. Improving the Game With Reference Images

The first version of SkateCity worked, but the character animations looked stiff, and the city felt a little empty. We’ll see if Claude Haiku 5.5 could improve the game using a reference image.

I chose a screenshot from Tony Hawk's Pro Skater 3+4 because it clearly shows the skateboarder's posture, the board, and the skatepark environment. My goal was to improve SkateCity while keeping its original low-poly style.

Just attach the image to the same Claude Code conversation and ask Claude Haiku 5.5 to update the playable browser version.

I want you to improve the existing SkateCity browser game using the attached reference image.

First, inspect the current project and identify the visual and animation problems in the playable browser version.

Don't rebuild the game from scratch.
Don't replace the browser game with a terminal application.

1. Visual Improvements
- Use the reference image to improve the environment and character proportions.
- Keep SkateCity's existing low-poly art style.
- Add more detailed ramps, rails, and skatepark structures.
- Improve buildings, sidewalks, lighting, and background details.
- Make pedestrian movement look more natural.
- Do not attempt a pixel-perfect recreation.

2. Fix Skateboard Animation
- Make the skateboard move independently from the character.
- During kickflips, rotate only the skateboard.
- Keep the rider's legs and upper body in natural positions.
- Make the feet separate from the board during tricks.
- Ensure both feet return to the board during landing.
- Prevent the character's body or legs from rotating with the skateboard.

3. Preserve and Improve Gameplay
- Keep all existing controls and trick mechanics.
- Preserve scoring, combos, traffic, and collisions.
- Keep the cinematic replay system working.
- Improve movement and landing animations.
- Avoid breaking existing features.

4. Test the Updated Game
- Test ollies, kickflips, shove-its, and 360 spins.
- Check that the skateboard rotates independently.
- Verify that the character lands correctly.
- Test scoring, collisions, and cinematic replay.
- Fix any new bugs introduced by the changes.

IMPORTANT:
- Apply all changes to the existing browser version.
- Preserve the original C++ source code.
- Work only in the current local workspace.
- Don't publish, deploy, upload, or push anything to GitHub.
- Launch the local browser preview when finished.

Report what you improved and list any remaining issues.

The updated SkateCity was pretty disappointing. Claude Haiku 5.5 added a skatepark and some ramps, but the graphics still looked rough, with barely any improvement over the first version.

It somehow ended up with a game that looks like it was built from a handful of basic shapes. Claude Haiku 5.5 only noticed the ramps.

From what I've seen, Claude Haiku 5.5 still struggles with visual improvements based on reference images. The game is playable, but the graphics are nowhere near what I expected.

IV. Claude Haiku 5.5 #3: Blender and Godot Test

After the disappointing skateboarding game, I decided to give Claude Haiku 5.5 another shot at 3D game development. This time, I used Blender for the 3D models and Godot for the gameplay.

The challenge was to build a backyard pool party game with playable characters, water effects, and interactive activities. Let’s see if Claude Haiku 5.5 could do a better job with a proper game engine.

I used Ultra Code mode for this test. Here's the prompt I prepared:

Build a complete, playable 3D backyard pool party game using Blender and Godot.

I want a fun, colorful game inspired by casual party games such as Wii Sports.

You must create the 3D assets in Blender and use Godot to build the gameplay.

PROJECT REQUIREMENTS

1. Backyard Environment
- Create a detailed backyard with a swimming pool.
- Add a diving board, poolside furniture, fences, and decorations.
- Include string lights, trees, and outdoor lighting.
- Create realistic-looking water with animated surface effects.
- Use a colorful, playful visual style.

2. Character System
- Create several selectable characters.
- Give each character a unique appearance.
- Add basic character animations.
- Include a friendly dog that can jump into the pool.
- Make character movement smooth and responsive.

3. Gameplay Mechanics
- Build a pool-jumping game with simple, enjoyable controls.
- Let players build jump power using a timing-based meter.
- Use Space to control the jump timing.
- Highlight yellow and green zones for successful timing.
- Support limited movement while the character is airborne.
- Add scoring based on timing, jump quality, and landing.

4. Game Modes
- Create a main game mode.
- Add a Practice mode where players can learn the controls.
- Include a character selection screen.
- Show results and star ratings after each attempt.

5. Visual Effects
- Add splash effects when characters enter the water.
- Animate water movement around the player.
- Create smooth jumping and landing animations.
- Add environmental details that make the backyard feel alive.
- Make the dog interact with the pool.

6. User Interface
- Design a clean, colorful interface inspired by casual console games.
- Include a main menu, character selection, and settings.
- Display controls during gameplay.
- Add scoring and result screens.
- Make the menus easy to navigate.

7. Technical Requirements
- Use Blender to create the required 3D assets.
- Export the assets into Godot-compatible formats.
- Use Godot for gameplay, physics, and UI.
- Organize the project into reusable scenes and scripts.
- Handle missing assets and runtime errors.
- Keep the game fully playable offline.

8. Testing
- Verify character selection and movement.
- Test the jump timing system.
- Check scoring and star ratings.
- Test Practice mode.
- Verify water effects and dog animations.
- Fix errors before finishing.

FINAL DELIVERABLE

Provide:
- Complete Blender source files
- A working Godot project
- All required 3D assets
- Instructions to run the game locally
- A list of known limitations

IMPORTANT:
- Work only in the current local workspace.
- Don't publish, deploy, or upload anything.
- Don't create or push anything to GitHub.
- Don't connect to external hosting services.
- Don't create public sharing links.

When finished, launch the game locally and verify that the main gameplay works.

Claude Haiku 5.5 did a much better job in this test. The backyard looked colorful, with a swimming pool, animated water, string lights, and a few nice decorations.

I tested the diving game using Space to control my jump power, A/D to steer, and W/S to adjust my spin in midair.

My first attempt was a complete miss. So, even with Claude building the game, I still have to learn how to jump into a swimming pool.

I also tried Practice Mode, which gave me a detailed score after each dive. On one attempt, I scored 58/100 and earned three stars. The game even told me I'd jumped too hard and landed 1.3 meters away from the target.

What impressed me most was how much detail Claude Haiku 5.5 put into the gameplay. I could adjust my movement in the air, check my landing accuracy, and see exactly where I went wrong.

The graphics still looked a little rough in places, but compared with SkateCity, this felt like a much more complete game. Claude Haiku 5.5 handled the Blender and Godot project surprisingly well, especially the interactive gameplay and scoring system.

V. Claude Haiku’s Pricing and Specifications

Anthropic made Claude Haiku 5.5 much cheaper than Haiku 4.5, especially when your prompts stay under 100,000 tokens.

Here's the official API pricing per 1 million tokens:

For prompts up to 100K tokens, Claude Haiku 5.5 costs 90% less than Haiku 4.5 per input and output token. Anthropic also says around 90% of requests to the previous Haiku model fall within this limit.

As for the specs, Claude Haiku 5.5 has a 1 million-token context window, supports up to 128K output tokens, and has a knowledge cutoff of June 2026.

The pricing looks great. But if I have to rerun the same task several times, those cheap tokens might not save me much money after all.

Conclusion

After three hands-on tests, Claude Haiku 5.5 surprised me. I got a working operating system, a playable skateboarding game, and a surprisingly fun 3D pool party game. That's a lot for a budget model.

But SkateCity was a reality check. Even with a reference image, the graphics still looked like something made from cardboard boxes. Apparently, good taste costs extra.

My verdict? Claude Haiku 5.5 is worth trying for coding experiments and quick prototypes, especially when you're watching your budget.

If you need polished results, though, I'd go with Sonnet or Opus. Cheap tokens are great until you're the one fixing everything.

If you are interested in other topics and how AI is transforming different aspects of our lives or even in making money using AI with more detailed, step-by-step guidance, you can find our other articles here:

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