Model comparison
Claude Opus 5.5 vs Grok 4.7
- Input
- $4.00
- Output
- $20.00
- Context
- 1M
- Released
- 2026-09-22
- Input
- $2.00
- Output
- $6.00
- Context
- 500K
- Released
- 2026-09-21
Claude Opus 5.5 scores higher on 2 of the 2 benchmarks both models report; Grok 4.7 is cheaper on input tokens ($2 vs $4 per 1M, 2×); Claude Opus 5.5 has the larger context window (1M vs 500K).
Specs and pricing side by side
| Spec | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Maker | Anthropic | SpaceXAI |
| Released | 2026-09-22 | 2026-09-21 |
| Context window | 1M | 500K |
| Max output | 128K | not published |
| Input price | $4.00 | $2.00 |
| Output price | $20.00 | $6.00 |
| License | Proprietary | Proprietarysame |
| Weights | API only | API onlysame |
| Modalities | Text, Vision | Text, Visionsame |
| Knowledge cutoff | Jun 2026 | May 2026 |
Not published by either maker: parameters.
Benchmarks both models report
| Benchmark | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Terminal-Bench 4.0 | 66.4% | 38% |
| CursorBench 4.0 | 57.8% | 46.3% |
Scores are as published by each maker or its cited source; harness, reasoning effort and date can differ between rows, so treat small gaps as ties. Sources are listed on each model page.
Which one should you pick?
Pick Claude Opus 5.5 if…
- You care about Terminal-Bench 4.0, CursorBench 4.0 (it scores higher on 2 shared benchmarks).
- You need the longer context (1M vs 500K).
- Your use case is: reach for it when an agent has to run for hours across a large codebase and per-token cost, not capability, is the binding constraint.
Pick Grok 4.7 if…
- Cost matters: input tokens cost 2× less ($2 vs $4 per 1M).
- Your use case is: reach for it for coding agents in Cursor, Grok Build or GitHub Copilot that must hold a task across many steps.
FAQ
Which is better, Claude Opus 5.5 or Grok 4.7?
Claude Opus 5.5 scores higher on 2 of the 2 benchmarks both models report; Grok 4.7 is cheaper on input tokens ($2 vs $4 per 1M, 2×); Claude Opus 5.5 has the larger context window (1M vs 500K). The better pick depends on whether you value benchmark scores, price per token, context length or openness for your workload.
How much cheaper is Grok 4.7?
Claude Opus 5.5: $4.00 input, $20.00 output. Grok 4.7: $2.00 input, $6.00 output (list API prices as published by each maker).
What are the context windows of Claude Opus 5.5 and Grok 4.7?
Claude Opus 5.5 offers 1M with up to 128K output; Grok 4.7 offers 500K.
Is Claude Opus 5.5 newer than Grok 4.7?
Claude Opus 5.5 was released 2026-09-22; Grok 4.7 was released 2026-09-21.