Choose Grok 4.7 if
- ✓ The output itself is long — generated code, migrations, documents
- ✓ You are running many attempts and want the cheaper second and third try
- ✓ You want a 500K window with a large output allowance at a mid-tier price
Head to head · OpenRouter
Grok 4.7 vs Claude Opus 5.5
Two flagships, one at half the output price. Grok 4.7 lists $2 / $6 per million with a 500K window and a 450K output ceiling; Claude Opus 5.5 lists $4 / $20 with a 1M window and 128K output. So Grok is cheaper on both sides and allows far longer answers, while Opus offers twice the input window.
Quick verdict
The interesting number is not the price, it is the two ceilings: 450K output at $6 per million is a shape of capability that Opus at $20 does not sell. If your work is long-running engineering loops where the model must produce and check a lot of text, Grok's economics are different in kind; if the job is a large codebase in one window, Opus buys the window.
Side-by-side comparison
| Field | Grok 4.7 | Claude Opus 5.5 |
|---|---|---|
| Provider | SpaceXAI | Anthropic |
| Context window | 500K tokens | 1M tokens |
| Input / 1M | $2.00 | $4.00 |
| Output / 1M | $6.00 | $20.00 |
| Modalities | Text, Vision, Files | Text, Vision, Files |
| Best for | Coding, Agents | Overall, Coding, Agents |
Source
openrouter.ai/api/v1/models Verified 2026-10-10 Cost estimates
| Workload | Input | Output | Grok 4.7 | Claude Opus 5.5 |
|---|---|---|---|---|
| Quick test | 20,000 | 5,000 | $0.070 | $0.180 |
| Product chat month | 500,000 | 125,000 | $1.75 | $4.50 |
| Document batch | 5,000,000 | 1,000,000 | $16.00 | $40.00 |
Estimates use list input/output prices and exclude cache discounts, provider surcharges and tool fees.
Choose Claude Opus 5.5 if
- ✓ The job needs the full 1M-token window in one pass
- ✓ You need the top of the Claude line for review-heavy multi-step work
- ✓ Cached reads matter: $0.20 per million against Grok's $0.50
FAQ
Is Grok 4.7 cheaper than Claude Opus 5.5?
Grok 4.7 costs $2.00 input and $6.00 output per 1M tokens. Claude Opus 5.5 costs $4.00 input and $20.00 output per 1M tokens.
Which model has the larger context window?
Grok 4.7 offers 500K tokens; Claude Opus 5.5 offers 1M tokens. Provider-specific limits can vary by route.
Which one should I choose?
The interesting number is not the price, it is the two ceilings: 450K output at $6 per million is a shape of capability that Opus at $20 does not sell. If your work is long-running engineering loops where the model must produce and check a lot of text, Grok's economics are different in kind; if the job is a large codebase in one window, Opus buys the window.
Grok 4.7 details Claude Opus 5.5 details Estimate monthly cost
Pricing and context data are based on a 2026-10-10 snapshot. Provider limits and pricing can change; verify on OpenRouter before production.