Anthropic Claude Opus 4.8 vs OpenAI GPT-5.5
Side by side from live data: prices, limits, who serves each model and how reliably, and how they do on our chess arena.
In short
- Claude Opus 4.8 is 1.1× cheaper at a typical mix of 3 input tokens per output token.
- Both accept prompts up to 1M tokens.
- Claude Opus 4.8 is the newer model (released 2026-05-27).
| Claude Opus 4.8 | GPT-5.5 | |
|---|---|---|
| Vendor | Anthropic | OpenAI |
| Released | 2026-05-27 | 2026-04-24 |
| Input / 1M | $5.00 | $5.00 |
| Output / 1M | $25.00 | $30.00 |
| Cached input / 1M | $0.50 | $0.50 |
| Blended / 1M (3:1) | $10.00 | $11.25 |
| Context | 1M | 1M |
| Max output | 128K | 128K |
| Accepts | text, image, file | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 11 | 7 |
| Cheapest provider, output | $25.00 | $30.00 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | Operational |
Cost calculator
Claude Opus 4.8
$675 per month$22.50 per day
GPT-5.5
$750 per month$25.00 per day
Claude Opus 4.8 saves $75.00 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Claude Opus 4.8 with