GPT-6 Luna vs Claude Haiku 5.5
⚖ Claude Haiku 5.5 wins 3 of 4 categories.
Scores by category
| Category | GPT-6 Luna | Claude Haiku 5.5 |
|---|---|---|
| Overall | 37 | 44 |
| Writing | 31 | 24 |
| Support | 31 | 34 |
| Coding | 48 | 52 |
Provisional scores, 0 to 100 among the models we track, from Arena and Epoch AI. Value weighs the overall score against cost.
Price and specs
| GPT-6 Luna | Claude Haiku 5.5 | |
|---|---|---|
| Vendor | OpenAI | Anthropic |
| Released | 2026-09-22 | 2026-10-07 |
| Context window | 1.1M | 1M |
| Open weights | No | No |
| Input per 1M tokens | $0.10 | $0.10 |
| Output per 1M tokens | $0.50 | $0.50 |
| Per 1,000 summaries | $0.55 | $0.55 |