# Claude Opus 5.5 vs Grok 4.7

As of October 21, 2026, Claude Opus 5.5 costs 100% more per input token than Grok 4.7 ($4.00 vs $2.00 per 1M) and has a 1M-token context window versus 500K.

- Page: https://models.litellm.ai/compare/claude-opus-5-5-vs-grok-4.7
- Claude Opus 5.5: https://models.litellm.ai/models/claude-opus-5-5
- Grok 4.7: https://models.litellm.ai/models/grok-4.7

## Side by side

| | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Input, per 1M tokens | $4.00 | $2.00 |
| Output, per 1M tokens | $20.00 | $6.00 |
| Cache read, per 1M tokens | $0.20 | $0.50 |
| Cache write, per 1M tokens | $5.00 | – |
| Context window | 1,000,000 tokens | 500,000 tokens |
| Max output | 128,000 tokens | 500,000 tokens |
| Image input | Yes | Yes |
| Tool calling | Yes | Yes |
| Structured output (JSON) | Yes | Yes |
| Prompt caching | Yes | Yes |
| Reasoning | Yes | Yes |
| Providers on LiteLLM | 8 | 6 |
| Price shown is from | Anthropic | xAI |
| Added to LiteLLM | September 22, 2026 | September 21, 2026 |

Headline prices in USD per 1M tokens, from LiteLLM's model price file.

## Cheapest provider for each

- Claude Opus 5.5: Anthropic at $4.00 input per 1M tokens (`claude-opus-5-5`)
- Grok 4.7: xAI at $2.00 input per 1M tokens (`xai/grok-4.7`)

## Benchmark scores

| Benchmark | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Epoch Capabilities Index (Overall) | 168.8 | 154.4 |
| FrontierCode (Coding and agents) | 54.6% (medium) | 47.6% |
| FrontierSWE (Coding and agents) | 62.3% (max) | 29.5% (xhigh) |
| APEX-Agents (Coding and agents) | 73.5% (max) | 54.6% |
| GPQA Diamond (Reasoning and knowledge) | 90.6% (max) | 92.7% (xhigh) |
| ARC-AGI-2 (Reasoning and knowledge) | 93.3% (high) | 61.4% (xhigh) |
| SimpleQA Verified (Reasoning and knowledge) | 72.2% (max) | 56.0% (xhigh) |
| FrontierMath (tiers 1-3) (Math) | 91.2% (max) | 53.0% (xhigh) |
| FrontierMath (tier 4) (Math) | 95.0% (max) | 17.1% (xhigh) |
| OTIS Mock AIME 2024-2025 (Math) | 100.0% (max) | 98.1% (xhigh) |

From the Epoch AI Benchmarking Hub (https://epoch.ai/benchmarks), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/), data as of September 22, 2026: Epoch's own runs and results it collects from each benchmark's leaderboard. Higher is better.

## When to pick which

- Claude Opus 5.5: Larger context window: 1,000,000 vs 500,000 tokens.
- Grok 4.7: Costs 50% less per input token: $2.00 vs $4.00 per 1M.
- Grok 4.7: Returns up to 500,000 tokens per response, vs 128,000.

## FAQ

### Which is cheaper, Claude Opus 5.5 or Grok 4.7?

Grok 4.7 is cheaper at 3 input tokens per output token: $3.00 per 1M tokens blended ($2.00 input, $6.00 output), versus $8.00 ($4.00 and $20.00) for Claude Opus 5.5, as of October 21, 2026.

### Which has the larger context window, Claude Opus 5.5 or Grok 4.7?

Claude Opus 5.5 has the larger context window: 1,000,000 tokens, versus 500,000 for Grok 4.7.

### Can I switch from Claude Opus 5.5 to Grok 4.7 without changing my code?

Yes. Through LiteLLM both use the OpenAI format, so switching means changing the model name from "claude-opus-5-5" to "xai/grok-4.7", or pointing a LiteLLM gateway model alias at the other model. You can also use one as a fallback for the other.