Model Comparison

Claude 3 Haiku vs GPT-5.6 LunaWhich is better in 2026?

GPT-5.6 Luna significantly outperforms across most benchmarks. Claude 3 Haiku is 4.5x cheaper per token.

Verdict: Claude 3 Haiku vs GPT-5.6 Luna — which is better?

Claude 3 Haiku (by Anthropic) and GPT-5.6 Luna (by OpenAI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.

Claude 3 Haiku outperforms in 0 benchmarks, while GPT-5.6 Luna is better at 1 benchmark (GPQA). GPT-5.6 Luna significantly outperforms across most benchmarks.

On price, Claude 3 Haiku is roughly 4.5x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.6 Luna also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Claude 3 Haiku if…

  • cost matters — it's about 4.5x cheaper per token

Choose GPT-5.6 Luna if…

  • you want the strongest raw capability — it leads on 1 of 1 shared benchmarks
  • you process long inputs — it offers a 1,050,000 token context window
  • you want the most recent training data — it shipped Jul 2026

Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

Claude 3 Haiku outperforms in 0 benchmarks, while GPT-5.6 Luna is better at 1 benchmark (GPQA).

GPT-5.6 Luna significantly outperforms across most benchmarks.

Sat Jul 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Claude 3 Haiku costs less

For input processing, Claude 3 Haiku ($0.25/1M tokens) is 4.0x cheaper than GPT-5.6 Luna ($1.00/1M tokens).

For output processing, Claude 3 Haiku ($1.25/1M tokens) is 4.8x cheaper than GPT-5.6 Luna ($6.00/1M tokens).

In conclusion, GPT-5.6 Luna is more expensive than Claude 3 Haiku.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sat Jul 18 2026 • llm-stats.com
Anthropic
Claude 3 Haiku
Input tokens$0.25
Output tokens$1.25
Best providerAnthropic
OpenAI
GPT-5.6 Luna
Input tokens$1.00
Output tokens$6.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.6 Luna accepts 1,050,000 input tokens compared to Claude 3 Haiku's 200,000 tokens. Claude 3 Haiku can generate longer responses up to 200,000 tokens, while GPT-5.6 Luna is limited to 128,000 tokens.

Anthropic
Claude 3 Haiku
Input200,000 tokens
Output200,000 tokens
OpenAI
GPT-5.6 Luna
Input1,050,000 tokens
Output128,000 tokens
Sat Jul 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Claude 3 Haiku and GPT-5.6 Luna support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

Claude 3 Haiku

Text
Images
Audio
Video

GPT-5.6 Luna

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Claude 3 Haiku

Proprietary

Closed source

GPT-5.6 Luna

Proprietary

Closed source

Release Timeline

When each model was launched

Claude 3 Haiku was released on 2024-03-13, while GPT-5.6 Luna was released on 2026-07-09.

GPT-5.6 Luna is 28 months newer than Claude 3 Haiku.

Claude 3 Haiku

Mar 13, 2024

2.3 years ago

GPT-5.6 Luna

Jul 9, 2026

1 weeks ago

2.3yr newer

Knowledge Cutoff

When training data ends

GPT-5.6 Luna has a documented knowledge cutoff of 2026-02-16, while Claude 3 Haiku's cutoff date is not specified.

We can confirm GPT-5.6 Luna's training data extends to 2026-02-16, but cannot make a direct comparison without Claude 3 Haiku's cutoff date.

Claude 3 Haiku

—

GPT-5.6 Luna

Feb 2026

Provider Availability

Claude 3 Haiku is available from Anthropic, Bedrock, Google. GPT-5.6 Luna is available from OpenAI.

Claude 3 Haiku

anthropic logo
Anthropic
Input Price:Input: $0.25/1MOutput Price:Output: $1.25/1M
bedrock logo
AWS Bedrock
Input Price:Input: $0.25/1MOutput Price:Output: $1.25/1M
google logo
Google
Input Price:Input: $0.25/1MOutput Price:Output: $1.25/1M

GPT-5.6 Luna

openai logo
OpenAI
Input Price:Input: $1.00/1MOutput Price:Output: $6.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Anthropic
Less expensive input tokens
Less expensive output tokens
OpenAI
Larger context window (1,050,000 tokens)
Higher GPQA score (92.3% vs 33.3%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Claude 3 Haiku and GPT-5.6 Luna side-by-side, then vote on the output you prefer.

Claude 3 Haiku
✓ Preferred
GPT-5.6 Luna
Open in Playground
AI Model Comparison Table
Feature
Anthropic
Claude 3 Haiku
OpenAI
GPT-5.6 Luna

FAQ

Common questions about Claude 3 Haiku vs GPT-5.6 Luna.

Which is better, Claude 3 Haiku or GPT-5.6 Luna?

GPT-5.6 Luna significantly outperforms across most benchmarks. Claude 3 Haiku is made by Anthropic and GPT-5.6 Luna is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Claude 3 Haiku compare to GPT-5.6 Luna in benchmarks?

Claude 3 Haiku scores ARC-C: 89.2%, GSM8k: 88.9%, HellaSwag: 85.9%, DROP: 78.4%, HumanEval: 75.9%. GPT-5.6 Luna scores Connectors: 99.9%, HealthBench Consensus: 95.1%, GPQA: 92.3%, Search and Function-Calling: 89.7%, Capture-the-Flag Challenges (Internal): 85.2%.

Is Claude 3 Haiku cheaper than GPT-5.6 Luna?

Claude 3 Haiku is 4.0x cheaper for input tokens. Claude 3 Haiku costs $0.25/M input and $1.25/M output via anthropic. GPT-5.6 Luna costs $1.00/M input and $6.00/M output via openai.

What are the context window sizes for Claude 3 Haiku and GPT-5.6 Luna?

Claude 3 Haiku supports 200K tokens and GPT-5.6 Luna supports 1.1M tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Claude 3 Haiku and GPT-5.6 Luna?

Key differences include context window (200K vs 1.1M), input pricing ($0.25 vs $1.00/M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude 3 Haiku and GPT-5.6 Luna?

Claude 3 Haiku is developed by Anthropic and GPT-5.6 Luna is developed by OpenAI.

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