Claude Sonnet 5 vs GPT-6 Astra
Side-by-side API pricing and Artificial Analysis performance for Claude Sonnet 5 (Anthropic) and GPT-6 Astra (OpenAI). Green cells mark the better value in each row.
Prices updated Sep 18, 2026, 11:36 AM UTC · refreshed hourly
| Claude Sonnet 5 Anthropic | GPT-6 Astra OpenAI | |
|---|---|---|
| Pricing | ||
| Input $/1M | $2.00 | $10.00 |
| Output $/1M | $10.00 | $50.00 |
| Blended $/1M (3:1) | $4.00 | $20.00 |
| RAG example (30K in / 2K out) | $0.08 | $0.4 |
| Quality & speed | ||
| Intelligence Index | 38.4 | 52.8 |
| Coding Index | 71.5 | 76.9 |
| Agentic Index | 44.3 | 51.5 |
| Output speed (tok/s) | 78 | 54 |
| Time to first token | 107.45s | 230.53s |
| Specs | ||
| Context window | 1M | 1.05M |
| Input modalities | text, image, file | file, image, text |
FAQ
Which is cheaper, Claude Sonnet 5 or GPT-6 Astra?
Claude Sonnet 5 has the lower blended API price at $4.00 per 1M tokens (3:1 input:output mix), versus $20.00 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), Claude Sonnet 5 costs about $0.08 per request versus $0.4. Also compare context windows: Claude Sonnet 5 offers 1M and GPT-6 Astra offers 1.05M.
Which scores higher on Artificial Analysis benchmarks?
GPT-6 Astra leads on the Artificial Analysis Intelligence Index (52.8 vs 38.4). Check coding and agentic indices on this page for workload-specific tradeoffs.