Claude Sonnet 4.6 vs GPT-5.6 Luna
Claude Sonnet 4.6 leads in 5 of 8 categories
Arena ELO
Claude Sonnet 4.6
Cheaper
Claude Sonnet 4.6
Faster
Claude Sonnet 4.6
Detailed Comparison
| Category | Claude Sonnet 4.6 | GPT-5.6 Luna |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Context Window | 1M WIN | 128K |
| Input Price ($/1M) | $2 WIN | $10 |
| Output Price ($/1M) | $12 WIN | $30 |
| Arena ELO | 1440 WIN | N/A |
| Coding | 79.6% SWE-bench | N/A |
| Reasoning | 72.5% OSWorld | N/A |
| Speed (tokens/sec) | ~80 t/s WIN | N/A |
| Open Source | No | No |
Frequently Asked Questions
Which is cheaper, Claude Sonnet 4.6 or GPT-5.6 Luna?
Claude Sonnet 4.6 is approximately 65% cheaper than GPT-5.6 Luna per million tokens.
Which is better for coding, Claude Sonnet 4.6 or GPT-5.6 Luna?
Claude Sonnet 4.6 scores 79.6% SWE-bench on coding benchmarks, while GPT-5.6 Luna scores N/A.
Which has a larger context window?
Claude Sonnet 4.6 supports 1M context, while GPT-5.6 Luna supports 128K.
Is Claude Sonnet 4.6 or GPT-5.6 Luna open source?
Claude Sonnet 4.6 is proprietary. GPT-5.6 Luna is proprietary.
Related Articles
Anthropic is building custom AI chips for Claude
August 2026 model rankings: Claude leads text, Kimi coding
Claude Code Is No Longer the Clear Front-Runner
Anthropic Builds Its Own Chip Team for Claude
Claude 4.5 proves AI progress is still accelerating
Icon’s Claude deal shows clinical trials need AI, not pilots
More Comparisons
Claude Sonnet 4.6 vs Claude Opus 4.5Claude Sonnet 4.6 vs Llama 4 ScoutClaude Sonnet 4.6 vs Claude Haiku 4.5Claude Sonnet 4.6 vs Qwen 3.6Claude Sonnet 4.6 vs Kimi K2.7 CodeClaude Sonnet 4.6 vs MiniMax H3Claude Sonnet 4.6 vs Llama 4 MaverickClaude Sonnet 4.6 vs GPT-5.3-CodexGPT-5.6 Luna vs Claude Opus 4.5GPT-5.6 Luna vs Llama 4 ScoutGPT-5.6 Luna vs Claude Haiku 4.5GPT-5.6 Luna vs Qwen 3.6GPT-5.6 Luna vs Kimi K2.7 CodeGPT-5.6 Luna vs MiniMax H3GPT-5.6 Luna vs Llama 4 MaverickGPT-5.6 Luna vs GPT-5.3-Codex