Anthropic Claude Opus 5.5 vs SpaceXAI Grok 4.6
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
- Grok 4.6 is 2.7× cheaper at a typical mix of 3 input tokens per output token.
- Claude Opus 5.5 accepts longer prompts: 1M vs 500K tokens.
- Claude Opus 5.5 is the newer model (released 2026-09-22).
| Claude Opus 5.5 | Grok 4.6 | |
|---|---|---|
| Vendor | Anthropic | SpaceXAI |
| Released | 2026-09-22 | 2026-08-12 |
| Input / 1M | $4.00 | $2.00 |
| Output / 1M | $20.00 | $6.00 |
| Cached input / 1M | $0.20 | $0.50 |
| Blended / 1M (3:1) | $8.00 | $3.00 |
| Context | 1M | 500K |
| Max output | 128K | 450K |
| Accepts | text, image, file | text, image, file |
| Reasoning | Yes | Yes |
| Providers on OpenRouter | 11 | 6 |
| Cheapest provider, output | $20.00 | $6.00 |
| Best provider uptime, 24 h | 100% | 100% |
| Chess arena rating | not playing | not playing |
| Vendor API status | Operational | Operational |
Cost calculator
Claude Opus 5.5
$540 per month$18.00 per day
Grok 4.6
$210 per month$7.00 per day
Grok 4.6 saves $330 a month on this workload.
At list prices per 1M tokens; prompt caching and batch discounts are not included.
Compare Claude Opus 5.5 with