Model decision surface

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Start with Claude Opus 5.5 and Grok 4.7, or choose any two current ranked language models. Compare capability evidence, price, context, provider availability, and weight access without pretending one field decides every use case.

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Current public data

Claude Opus 5.5 vs Grok 4.7

Live dataset updated 9/22/2026, 10:37:09 PM UTC

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Factual comparison of Claude Opus 5.5 and Grok 4.7
Field	Claude Opus 5.5 Anthropic	Grok 4.7 xAI
ModelCap position	#1	#4
Index score	98.6	88.2
Evidence	Measured2 public benchmark observations across 2 boards	Measured1 public benchmark observation across 1 board
Input / 1M	$4.00	$1.60
Output / 1M	$20.00	$4.80
Pricing status	fresh	fresh
Context	1M	500K
Providers	5	1
Weight access	API only	API only

Decision facts

Claude Opus 5.5 is #1; Grok 4.7 is #4 on the same current language board.
Index scores are 98.6 for Claude Opus 5.5 and 88.2 for Grok 4.7. Their published uncertainty intervals overlap, so the rank difference alone does not establish a reliable capability advantage for your workload.
Both positions use Measured evidence.
Listed output price per 1M tokens is $20.00 for Claude Opus 5.5 and $4.80 for Grok 4.7. For 1,000 requests with 2,000 input and 500 output tokens each (2M input + 0.5M output), the listed-rate estimate is $18.00 for Claude Opus 5.5 versus $5.60 for Grok 4.7. Grok 4.7 costs 68.9% less in this scenario. This excludes caching, batch discounts, prompt-length tiers, tool charges and retries; verify the selected endpoint before budgeting.
Published context is 1,000,000 tokens for Claude Opus 5.5 and 500,000 for Grok 4.7.
ModelCap currently lists 5 providers for Claude Opus 5.5 and 1 for Grok 4.7.

These are separate published fields, not a synthetic winner. ModelCap does not collapse price, access, context, and capability evidence into a hidden recommendation score.

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Each comparison page is a permanent, shareable URL with the same live figures as this tool: ModelCap Index position, API pricing, context window, provider count, weight access and every shared benchmark board.