GPT-6 Luna vs Claude Haiku 5.5
Short answer
GPT-6 Luna and Claude Haiku 5.5 cost the same for a typical 3:1 input-to-output mix. Claude Haiku 5.5 scores higher on ARC-AGI-2 (61.3% vs 59.3%).
Prices updated Oct 23, 2026 (APIpulse, CC BY 4.0) · Benchmarks: ARC Prize, Vals.ai · all models
| GPT-6 Luna | Claude Haiku 5.5 | |
|---|---|---|
| Provider | OpenAI | Anthropic |
| Input / 1M tokens | $0.10 | $0.10 |
| Output / 1M tokens | $0.50 | $0.50 |
| Blended (3:1) / 1M | $0.20 | $0.20 |
| Context window | 1.05M | 1M |
| ARC-AGI-2 | 59.3% (Max) | 61.3% (XHigh) |
| SWE-bench Verified | — | — |
API cost calculator
Enter your monthly usage in millions of tokens (1M tokens ≈ 750,000 words).
GPT-6 Lunacheapest$2 / month$24 / year
Claude Haiku 5.5cheapest$2 / month$24 / year
Standard rates; batch processing and prompt caching can lower the bill.
Frequently asked questions
Which is cheaper, GPT-6 Luna or Claude Haiku 5.5?
GPT-6 Luna and Claude Haiku 5.5 cost the same for a typical 3:1 input-to-output mix.
How much do GPT-6 Luna and Claude Haiku 5.5 cost per month?
For 10M input and 2M output tokens a month: GPT-6 Luna costs $2 and Claude Haiku 5.5 costs $2.
More: GPT-6 Luna pricing · Claude Haiku 5.5 pricing · all API prices
Benchmarks updated Oct 24, 2026.