Claude Haiku 4.5 vs GPT-5.6 Luna
Claude Haiku 4.5 and GPT-5.6 Luna are both current production-tier models. GPT-5.6 Luna has a 1.1M context window — about 5× the 200k of Claude Haiku 4.5. GPT-5.6 Luna leads on reasoning, general knowledge, long-context retrieval.
Specs side by side
| Metric | Anthropic Claude Haiku 4.5 | OpenAI GPT-5.6 Luna |
|---|---|---|
| Input price (per 1M) | $1 | $1 |
| Output price (per 1M) | $5 | $6 |
| Context window | 200k tokens | 1.1M tokens |
| Speed tier | fast | fast |
| Open weights | No | No |
| EU region | Yes | Yes |
| Free tier | No | No |
| Prompt caching | Yes | Yes |
| Vision input | Yes | Yes |
| Extended thinking | No | Yes |
When to choose each
Choose Claude Haiku 4.5 if…
- Claude Haiku 4.5 is in the same tier as GPT-5.6 Luna — pick by provider preference or API ecosystem
Choose GPT-5.6 Luna if…
- You need 1.1M context (5× more than Claude Haiku 4.5)
- Reasoning is central to your workload
- General knowledge is central to your workload
Benchmark delta
Claude Haiku 4.5 leads on
Claude Haiku 4.5 has no meaningful benchmark lead in this pair.
GPT-5.6 Luna leads on
- Reasoning
- General knowledge
- Long-context retrieval
- Multilingual
- Vision
FAQ — Claude Haiku 4.5 vs GPT-5.6 Luna
Claude Haiku 4.5 vs GPT-5.6 Luna — which is better?
Claude Haiku 4.5 and GPT-5.6 Luna are both current production-tier models. GPT-5.6 Luna has a 1.1M context window — about 5× the 200k of Claude Haiku 4.5. GPT-5.6 Luna leads on reasoning, general knowledge, long-context retrieval. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does Claude Haiku 4.5 pricing compare to GPT-5.6 Luna?
Claude Haiku 4.5 costs $1 / $5 per 1M vs GPT-5.6 Luna at $1 / $6 per 1M. Claude Haiku 4.5 is cheaper on output tokens by roughly 20%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does Claude Haiku 4.5 or GPT-5.6 Luna have the bigger context window?
GPT-5.6 Luna has a 1.1M-token context window — 5× the 200k context of Claude Haiku 4.5. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for Claude Haiku 4.5 or GPT-5.6 Luna?
Claude Haiku 4.5: no — No free API tier; new accounts get starter credits. GPT-5.6 Luna: no — Low-cost at $1/$6 per 1M; starter credits only.
Which is better for coding — Claude Haiku 4.5 or GPT-5.6 Luna?
GPT-5.6 Luna leads on coding benchmarks (Claude Haiku 4.5: 82/100, GPT-5.6 Luna: 85/100). For production coding agents also weigh tool-use performance — Claude Haiku 4.5 scores 88, GPT-5.6 Luna scores 87.