Claude Sonnet 4.6 vs GPT-5.6 Terra
Side-by-side API pricing and Artificial Analysis performance for Claude Sonnet 4.6 (Anthropic) and GPT-5.6 Terra (OpenAI). Green cells mark the better value in each row.
Prices updated Jul 22, 2026, 1:36 AM UTC · refreshed hourly
| Claude Sonnet 4.6 Anthropic | GPT-5.6 Terra OpenAI | |
|---|---|---|
| Pricing | ||
| Input $/1M | $3.00 | $2.50 |
| Output $/1M | $15.00 | $15.00 |
| Blended $/1M (3:1) | $6.00 | $5.63 |
| RAG example (30K in / 2K out) | $0.12 | $0.105 |
| Quality & speed | ||
| Intelligence Index | 35.9 | 55 |
| Coding Index | 63 | 76.7 |
| Agentic Index | 40.8 | 47.4 |
| Output speed (tok/s) | 60 | 157 |
| Time to first token | 1.13s | 104.73s |
| Specs | ||
| Context window | 1M | 1.05M |
| Input modalities | text, image, file | file, image, text |
FAQ
Which is cheaper, Claude Sonnet 4.6 or GPT-5.6 Terra?
GPT-5.6 Terra has the lower blended API price at $5.63 per 1M tokens (3:1 input:output mix), versus $6.00 for the other model. Prices are live from OpenRouter and refresh about hourly.
Which is better for RAG workloads?
For a typical RAG request (30K input / 2K output tokens), GPT-5.6 Terra costs about $0.105 per request versus $0.12. Also compare context windows: Claude Sonnet 4.6 offers 1M and GPT-5.6 Terra offers 1.05M.
Which scores higher on Artificial Analysis benchmarks?
GPT-5.6 Terra leads on the Artificial Analysis Intelligence Index (55 vs 35.9). Check coding and agentic indices on this page for workload-specific tradeoffs.