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Claude Haiku 5.5 vs GPT-6 Luna

Claude Haiku 5.5 and GPT-6 Luna are closely matched at 50.3 and 43.9 on the LLM Stats Score. Claude Haiku 5.5 and GPT-6 Luna cost the same.

Anthropic · OpenAI · Updated for 2026

Which is better?

Claude Haiku 5.5 and GPT-6 Luna are closely matched on the overall LLM Stats Score at 50.3 and 43.9.

In the 1 individual benchmarks reported for both models, Claude Haiku 5.5 wins 1; this is a narrower head-to-head signal than the composite indexes.

GPT-6 Luna also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Claude Haiku 5.5

  • you value its reported benchmark strengths — it wins 1 of 1 exact shared results
  • you want the most recent training data — it shipped Oct 2026

Choose GPT-6 Luna

  • you process long inputs — it offers a 1,050,000 token context window

At a glance

The differences that matter most.

Claude Haiku 5.5
Anthropic
GPT-6 Luna
OpenAI
Core performance indexes
LLM Stats Score
50.3
#18
43.9
#45
Reasoning
47.4
#26
39.5
#66
Coding
40.7
#12
30.6
#53
Agents
33.7
#27
30.8
#38
Cost, coverage & limits
Benchmark wins
1 of 1
0 of 1
Input price
$0.10 / M
$0.10 / M
Output price
$0.50 / M
$0.50 / M
Context window
1,000,000
1,050,000

Capability indexes

Additional strengths measured across groups of related public benchmarks

1 shared
Index
Claude Haiku 5.5
GPT-6 Luna
Tool use
20.8#57
21.3#53
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

36 reported for Claude Haiku 5.5 · 5 for GPT-6 Luna

1 shared

Claude Haiku 5.5 outperforms in 1 benchmarks (FrontierCode 1.1), while GPT-6 Luna is better at 0 benchmarks.

Claude Haiku 5.5 significantly outperforms across most benchmarks.

Wed Oct 07 2026 • llm-stats.com

Human preference

Blind head-to-head votes and playground preference scores

Pricing Analysis

Price comparison per million tokens

For input processing, Claude Haiku 5.5 ($0.10/1M tokens) costs the same as GPT-6 Luna ($0.10/1M tokens).

For output processing, Claude Haiku 5.5 ($0.50/1M tokens) costs the same as GPT-6 Luna ($0.50/1M tokens).

In conclusion, Claude Haiku 5.5 and GPT-6 Luna cost the same.*

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

Lowest available price from all providers
Wed Oct 07 2026 • llm-stats.com
Anthropic
Claude Haiku 5.5
Input tokens$0.10
Output tokens$0.50
Best providerAnthropic
OpenAI
GPT-6 Luna
Input tokens$0.10
Output tokens$0.50
Best providerOpenAI
Notice missing or incorrect data?

Context Window

Maximum input and output token capacity

GPT-6 Luna accepts 1,050,000 input tokens compared to Claude Haiku 5.5's 1,000,000 tokens. Both models can generate responses up to 128,000 tokens.

Anthropic
Claude Haiku 5.5
Input1,000,000 tokens
Output128,000 tokens
OpenAI
GPT-6 Luna
Input1,050,000 tokens
Output128,000 tokens
Wed Oct 07 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both Claude Haiku 5.5 and GPT-6 Luna support multimodal inputs.

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

Claude Haiku 5.5

Text
Images
Audio
Video

GPT-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 Haiku 5.5

Proprietary

Closed source

GPT-6 Luna

Proprietary

Closed source

Release Timeline

When each model was launched

Claude Haiku 5.5 was released on 2026-10-07, while GPT-6 Luna was released on 2026-09-22.

Claude Haiku 5.5 is 1 month newer than GPT-6 Luna.

Claude Haiku 5.5

Oct 7, 2026

0 days ago

2w newer
GPT-6 Luna

Sep 22, 2026

2 weeks ago

Knowledge Cutoff

When training data ends

Claude Haiku 5.5 has a knowledge cutoff of 2026-06-01, while GPT-6 Luna has a cutoff of 2026-05-18.

Claude Haiku 5.5 has more recent training data (up to 2026-06-01), making it potentially better informed about events through that date compared to GPT-6 Luna (2026-05-18).

Claude Haiku 5.5

Jun 2026

1 mo newer
GPT-6 Luna

May 2026

Provider Availability

Claude Haiku 5.5 is available from Anthropic. GPT-6 Luna is available from OpenAI.

Claude Haiku 5.5

anthropic logo
Anthropic
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M

GPT-6 Luna

openai logo
OpenAI
Input Price:Input: $0.10/1MOutput Price:Output: $0.50/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Claude Haiku 5.5 and GPT-6 Luna side-by-side, then vote on the output you prefer.

Claude Haiku 5.5
✓ Preferred
GPT-6 Luna
Open in Playground

FAQ

Common questions about Claude Haiku 5.5 vs GPT-6 Luna.

Which is better, Claude Haiku 5.5 or GPT-6 Luna?

Claude Haiku 5.5 and GPT-6 Luna are closely matched on the LLM Stats Score at 50.3 and 43.9. Claude Haiku 5.5 is made by Anthropic and GPT-6 Luna is made by OpenAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Claude Haiku 5.5 compare to GPT-6 Luna in benchmarks?

Claude Haiku 5.5 scores Global-MMLU: 87.8%, MILU: 87.6%, BenchCAD (with Python tool): 87.0%, Chartography: 86.2%, SWE-bench Multilingual: 83.7%. GPT-6 Luna scores DeepSWE 1.1: 66.6%, OSWorld 2.0: 52.7%, Agents' Last Exam: 50.9%, FrontierCode 1.1: 42.4%, AutomationBench v1.0.6: 20.7%.

Is Claude Haiku 5.5 cheaper than GPT-6 Luna?

Both models cost $0.10 per million input tokens.

What are the context window sizes for Claude Haiku 5.5 and GPT-6 Luna?

Claude Haiku 5.5 supports 1.0M tokens and GPT-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 Haiku 5.5 and GPT-6 Luna?

Key differences include LLM Stats Score (50.3 vs 43.9), context window (1.0M vs 1.1M). See the full comparison above for benchmark-by-benchmark results.

Who makes Claude Haiku 5.5 and GPT-6 Luna?

Claude Haiku 5.5 is developed by Anthropic and GPT-6 Luna is developed by OpenAI.

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