Claude Opus 5.5 vs Grok 4.7
A side-by-side comparison of Claude Opus 5.5 from Anthropic and Grok 4.7 from xAI, using published pricing, context windows, supported inputs, and release dates.
- Claude Opus 5.5 input
- $4
- Grok 4.7 input
- $2
Key differences
Grok 4.7 is 50% cheaper on input tokens ($2 vs $4 per 1M).
Claude Opus 5.5 has the larger context window: 1M vs 500K tokens.
Claude Opus 5.5 is the newer release (Sep 22, 2026, vs Sep 21, 2026).
Claude Opus 5.5 vs Grok 4.7 specs
| Spec | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Provider | Anthropic | xAI |
| Released | Sep 22, 2026 | Sep 21, 2026 |
| Context window | 1,000,000 tokens | 500,000 tokens |
| Input price / 1M tokens | $4 | $2 |
| Output price / 1M tokens | $20 | $6 |
| 10K in + 1K out request | $0.06 | $0.026 |
| Accepts | file, image, text | file, image, text |
| Produces | text | text |
| Tool calling | Yes | Yes |
| Structured outputs | Yes | Yes |
| Reasoning | Yes | Yes |
| Popularity | 47/100 | 35/100 |
Highlighted values are better on that spec: lower price, larger context window, newer release, or higher popularity. Prices in USD per 1M tokens as listed on OpenRouter.
Claude Opus 5.5 vs Grok 4.7 questions
Is Claude Opus 5.5 or Grok 4.7 cheaper?
Grok 4.7 has the lower listed input price ($2 per million tokens). For a request with 10,000 input and 1,000 output tokens, Claude Opus 5.5 costs about $0.06 and Grok 4.7 about $0.026.
Which has the larger context window?
Claude Opus 5.5 supports 1,000,000 tokens, the larger of the two.
Which model should I choose?
Pick the cheaper model for high-volume, simpler tasks, and test both on a sample of your real prompts before committing. Price and context size do not measure output quality on your specific workload.