Claude Opus 5.5 vs GPT-5 Pro
Price, context window & benchmark comparison
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Compare different models
Verdict: Claude Opus 5.5 is 5.2× cheaper than GPT-5 Pro on a typical 3:1 input/output mix. Claude Opus 5.5 has the larger context window (1M vs 400K).
| Claude Opus 5.5 | GPT-5 Pro | |
|---|---|---|
| Input price / 1M | $4.00 | $15.00 |
| Output price / 1M | $20.00 | $120.00 |
| Blended price (3:1) | $8.00 | $41.25 |
| Cached input / 1M | $0.20 | — |
| Context window | 1M | 400K |
| Max output | 128K | 128K |
| Intelligence index | 57.6 | — |
| Coding index | — | — |
| Providers | 11 | — |
| Best provider uptime (30m) | 100.0% | — |
| Vision input | Yes | Yes |
| Reasoning | Yes | Yes |
| Tool calling | Yes | Yes |
| Released | 2026-09-22 | 2025-10-06 |
| Retirement | — | — |
Cost calculator
FAQ
Which is cheaper, Claude Opus 5.5 or GPT-5 Pro?
Claude Opus 5.5 is 5.2× cheaper than GPT-5 Pro on a typical 3:1 input/output mix.
Claude Opus 5.5 vs GPT-5 Pro: which has a bigger context window?
Claude Opus 5.5: 1,000,000 tokens. GPT-5 Pro: 400,000 tokens.
How much would 1 million requests cost?
At 2,000 input + 500 output tokens per request: Claude Opus 5.5 ≈ $18,000, GPT-5 Pro ≈ $90,000.
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