Claude Opus 4.8 (Fast) vs GPT-5.6 Sol
Side-by-side API pricing and Artificial Analysis performance for Claude Opus 4.8 (Fast) (Anthropic) and GPT-5.6 Sol (OpenAI). Green cells mark the better value in each row.
Prices updated Jul 22, 2026, 1:33 AM UTC · refreshed hourly
| Claude Opus 4.8 (Fast) Anthropic | GPT-5.6 Sol OpenAI | |
|---|---|---|
| Pricing | ||
| Input $/1M | $10.00 | $5.00 |
| Output $/1M | $50.00 | $30.00 |
| Blended $/1M (3:1) | $20.00 | $11.25 |
| RAG example (30K in / 2K out) | $0.4 | $0.21 |
| Quality & speed | ||
| Intelligence Index | — | 58.9 |
| Coding Index | — | 77.4 |
| Agentic Index | — | 54 |
| Output speed (tok/s) | — | 70 |
| Time to first token | — | 112.90s |
| Specs | ||
| Context window | 1M | 1.05M |
| Input modalities | text, image, file | file, image, text |
FAQ
Which is cheaper, Claude Opus 4.8 (Fast) or GPT-5.6 Sol?
GPT-5.6 Sol has the lower blended API price at $11.25 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), GPT-5.6 Sol costs about $0.21 per request versus $0.4. Also compare context windows: Claude Opus 4.8 (Fast) offers 1M and GPT-5.6 Sol offers 1.05M.
Which scores higher on Artificial Analysis benchmarks?
GPT-5.6 Sol leads on the Artificial Analysis Intelligence Index (58.9 vs —). Check coding and agentic indices on this page for workload-specific tradeoffs.