Pyyan / Compare / GPT-5.6 Luna vs Claude Opus 5
GPT-5.6 Luna vs Claude Opus 5
2 of 5Language Models · verified 13 Aug 2026
GPT-5.6 LunaOpenAIcurrentClaude Opus 5Anthropiccurrent
| Specification | GPT-5.6 Luna | Claude Opus 5 |
|---|---|---|
| Summary | Fastest and cheapest GPT-5.6 tier. | Complex agentic coding and enterprise work at half the cost of Fable 5. |
| Context | 1M+ | 1M |
| Input ($/Mtok) | — | $5 |
| Output ($/Mtok) | — | $25 |
| Licence | Proprietary | Proprietary |
| Max output | — | 128K |
| Released | — | 24 Jul 2026 |
| Model ID | — | claude-opus-5 |
| Category | Language Models | Language Models |
| Official | OpenAI ↗ | Anthropic ↗ |
Highlighted rows are where these differ.
Claude Opus 5
- Thinking on by default — a step change over Opus 4.8
- 512-token prompt-cache minimum, down from 1024
- Separate rate-limit bucket from the Opus 4.x pool
Best for agentic coding.