Claude Opus 4.6 (Fast) vs GPT-5.5 Pro
Claude Opus 4.6 (Fast) is cheaper on output tokens, while GPT-5.5 Pro offers a larger context window. Choose Claude Opus 4.6 (Fast) or GPT-5.5 Pro based on the trade-off between cost, context, and the benchmarks that matter for your use case.
| Spec | Claude Opus 4.6 (Fast) | GPT-5.5 Pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input / 1M tokens | $30.00 | $30.00 |
| Output / 1M tokens | $150.00 | $180.00 |
| Context window | 1M | 1.1M |
| Parameters | — | — |
| Open weights | — | No |
| Released | — | Apr 2026 |
| LiveBench score | 76.8 | — |
| Epoch Capabilities Index score | — | 162 |
FAQ
Is Claude Opus 4.6 (Fast) or GPT-5.5 Pro cheaper?
Claude Opus 4.6 (Fast) is cheaper on output tokens ($150.00 vs $180.00 per 1M).
Which has the larger context window, Claude Opus 4.6 (Fast) or GPT-5.5 Pro?
GPT-5.5 Pro has the larger context window (1.1M tokens).
Pricing is indicative — confirm with the provider before production use. Highlighted values indicate the better figure for that row.