Claude Opus 5.5 vs Grok 4.7
Grok 4.7 costs less than Claude Opus 5.5 per token, $2 input and $6 output per 1M against $4 and $20, but reads half as much at once: 500K tokens against 1M. Its cached input is dearer, $0.50 against $0.20, and we have no benchmark score for Grok 4.7 to compare with those for Opus 5.5.
Cheap output, dear cache
Our feature session costs $10.32 on Grok 4.7 and $21.60 on Opus 5.5. With 90% of prompts read from the cache the gap shrinks to $3.84 against $5.18, because the Grok cache costs more than the Opus one. A long agent day is $94.50 against $195, or $33.75 against $41.10 cached.
Context and output
The two limits run the other way round. Grok 4.7 reads up to 500K tokens but can write up to 450K in one reply; Opus 5.5 reads up to 1M and writes up to 128K. Filling the whole window once costs $1.00 on Grok and $4.00 on Opus, for half the tokens.
Dates and what we don't know
Grok 4.7 was first listed on the API on 21 September 2026, a day before Anthropic released Opus 5.5 on 22 September. Opus 5.5 scored 66.4% on Terminal-Bench 4.0, 54.4% on FrontierCode 1.1 and 67.7% on Humanity's Last Exam with tools; we found no Grok 4.7 score on any of them. The listing we read doesn't say whether its weights are open.
Side by side
| Claude Opus 5.5 | Grok 4.7 | |
|---|---|---|
| Maker | Anthropic | xAI |
| Released | 22 September 2026[1] | 21 September 2026[2] first API listing |
| Context window | 1M tokens[1] | 500K tokens[3] As served by the price's provider on OpenRouter. |
| Max output | 128K tokens[1] | 450K tokens[3] As served by the price's provider on OpenRouter. |
| Input price | $4 per 1M tokens[1] | $2 per 1M tokens[3] |
| Output price | $20 per 1M tokens[1] | $6 per 1M tokens[3] |
| Cached input | $0.20 per 1M tokens[4] | $0.50 per 1M tokens[3] |
| Long prompts | One price | One price |
| Price change | None announced | None announced |
| Open weights | No[1] Offered through the Claude API and cloud platforms; no weights are published. | Not stated[2] |
| Reads | text, image[1] | text, image[2] |
Benchmarks
None of the benchmarks below has a published score for both models. We only show a score we can cite with its source and date; "Not published" means we found none for that model, not that it scored zero.
| Benchmark | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Terminal-Bench 4.0Agentic coding tasks in a real terminal. | 66.4%[5] Run at xhigh effort. | Not published |
| FrontierCode 1.1 (Main)Hard software engineering tasks. | 54.4%[5] Max effort. | Not published |
| Humanity's Last Exam (with tools)Expert-level questions across many fields, tools allowed. | 67.7%[5] | Not published |
What a coding session costs
Our own estimate from the list prices above, for three sessions we define: a coding agent resends the conversation with every call, so prompts are large and grow. "Cached" assumes 90% of prompt tokens are read from the prompt cache and leaves out cache write fees. A long-prompt price applies when a call's prompt is over its threshold. Work out your own mix with the token cost calculator.
| Session | Claude Opus 5.5 | Claude Opus 5.5 cached | Grok 4.7 | Grok 4.7 cached |
|---|---|---|---|---|
| Quick fix10 calls of 25K prompt and 1.5K output tokens | $1.30 | $0.45 | $0.59 | $0.25 |
| Feature session60 calls of 80K prompt and 2K output tokens | $21.60 | $5.18 | $10.32 | $3.84 |
| Long agent day300 calls of 150K prompt and 2.5K output tokens | $195 | $41.10 | $94.50 | $33.75 |
Value for money and release gap
Claude Opus 5.5 is dated 1 day later (Grok 4.7: first API listing). Price per point divides our feature-session cost by a published score: lower means more score for the money. It is a rough lens, not a ranking.
| Measure | Claude Opus 5.5 | Grok 4.7 |
|---|---|---|
| Input tokens per $1 | 250K | 500K |
| Filling the whole context window once | $4.00 | $1.00 |
Questions
Is Grok 4.7 cheaper than Claude Opus 5.5?
Per token, yes: $2 against $4 per 1M input tokens and $6 against $20 per 1M output. Our feature session costs $10.32 on Grok 4.7 and $21.60 on Opus 5.5.
Which has the larger context window?
Claude Opus 5.5, with 1M tokens against 500K for Grok 4.7. Grok allows longer replies: up to 450K output tokens against 128K.
How does Grok 4.7 score on benchmarks?
We found no Grok 4.7 score that we could cite on the three benchmarks we track. Opus 5.5 scored 66.4% on Terminal-Bench 4.0.
Most compared
Any other two models: pick them in the lists at the top of the page.
- Claude Opus 5.5 vs Claude Sonnet 5.5
- Claude Fable 5.1 vs Claude Opus 5.5
- Claude Opus 5 vs Claude Opus 5.5
- Claude Opus 5.5 vs GPT-6.1 Sol
- Claude Opus 5.5 vs GPT-5.6 Sol
- Claude Opus 5.5 vs GPT-6 Astra
- Claude Opus 5.5 vs Gemini 4 Argon
- Claude Opus 5.5 vs Gemini 3.1 Pro Preview
- Claude Opus 5.5 vs DeepSeek V4 Pro
- Claude Sonnet 5 vs Claude Sonnet 5.5
- Claude Haiku 5.5 vs Claude Sonnet 5.5
- Claude Haiku 4.5 vs Claude Haiku 5.5
- Claude Fable 5 vs Claude Fable 5.1
- Claude Sonnet 5.5 vs GPT-6.1 Sol
- Claude Fable 5.1 vs GPT-6 Astra
- Claude Haiku 5.5 vs GPT-6 Luna
- GPT-6.1 Sol vs GPT-6 Sol
- GPT-6.1 Sol vs GPT-6 Astra
- Claude Sonnet 5.5 vs Gemini 4 Argon
- Gemini 4 Argon vs GPT-6.1 Sol
- Gemini 3.1 Pro Preview vs Gemini 4 Argon
- Claude Haiku 5.5 vs Gemini 3.8 Flash
- Claude Sonnet 5.5 vs Kimi K3
- Claude Sonnet 5.5 vs GLM-5.3
More tools
Sources
Numbers from the makers' own pages, checked by hand, last read . List prices in US dollars before tax. Spotted a mistake? office@shuriken.sh.
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