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Comparison · 2 models · Updated Oct 4, 2026

Claude Opus 5.5 vs Grok 4.7

Too close to call on our weighted score (Claude Opus 5.5 64, Grok 4.7 61). The right pick depends on what you value most.

  1. Anthropic

    Claude Opus 5.5

    Released Sep 22, 2026

    64/100
    • ECI167.4
    • Price$4.00 / $20.00
    • Context1M
    Full specs Remove Claude Opus 5.5

  2. xAI

    Grok 4.7

    Released Sep 21, 2026

    61/100
    • ECI—
    • Price$2.00 / $6.00
    • Context500K
    Full specs Remove Grok 4.7

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01 — Verdict

Too close to call

It is close. Our weighted score puts them within 3 points (Claude Opus 5.5 64/100, Grok 4.7 61/100), so choose by what matters most for your work: Claude Opus 5.5 for raw capability and Grok 4.7 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%. Capability uses the average of shared benchmarks (GPQA Diamond, FrontierMath Tiers 1–3, OTIS Mock AIME 2024–2025 and SimpleQA Verified), because Grok 4.7 has no Capabilities Index score yet.

  • CapabilityClaude Opus 5.5Shared benchmarks: Claude Opus 5.5 88.5% · Grok 4.7 74.9%
  • Lowest priceGrok 4.7Grok 4.7 $3.00 · Claude Opus 5.5 $8.00 per 1M tokens (3:1 blend)
  • Longest contextClaude Opus 5.5Claude Opus 5.5 1,000,000 · Grok 4.7 500,000 tokens
  • Widest inputsSame inputsClaude Opus 5.5: Text, Images, PDFs · Grok 4.7: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightClaude Opus 5.5Grok 4.7
CapabilityShared benchmarks50%8975
Price25%727
Inputs & features15%8080
Context window10%6048
Overall100%64/10061/100
02 — Side by side

Every spec in one table

Highlighted cells lead their row. Dashes mean the data is not published.

Claude Opus 5.5 vs Grok 4.7 specifications side by side
SpecificationClaude Opus 5.5AnthropicGrok 4.7xAI
Capability
Capabilities Index (ECI)167.4—
ECI rank#1 of 148—
GPQA DiamondGraduate-level science questions90.6%92.7% (best)
FrontierMath Tiers 1–3Research-level mathematics91.2% (best)53.0%
OTIS Mock AIME 2024–2025Competition mathematics100% (best)98.1%
SimpleQA VerifiedShort factual questions72.2% (best)56.0%
Price per million tokens
Input$4.00$2.00 (best)
Output$20.00$6.00 (best)
Cached input$0.20 (best)$0.50
Blended (3:1)$8.00$3.00 (best)
Long-context rateSame rateOver 200K: $4.00 / $12.00
Price sourceOfficial Anthropic APIOfficial xAI API
Limits
Context window1,000,000 tokens (best)500,000 tokens
Max output128,000 tokens500,000 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesYes
AudioNoNo
VideoNoNo
ReasoningYeslow · medium · high · xhigh · maxYeslow · medium · high · xhigh
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDclaude-opus-5-5grok-4.7
API providers28 (best)17
ReleasedSep 22, 2026Sep 21, 2026
Knowledge cutoffJun 2026May 2026
03 — Cost

What would a month cost?

Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.

  • Claude Opus 5.5$80.00
  • Grok 4.7$32.00
04 — Questions

Which should you choose?

Which is better: Claude Opus 5.5 or Grok 4.7?

It is close. Our weighted score puts them within 3 points (Claude Opus 5.5 64/100, Grok 4.7 61/100), so choose by what matters most for your work: Claude Opus 5.5 for raw capability and Grok 4.7 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%. Capability uses the average of shared benchmarks (GPQA Diamond, FrontierMath Tiers 1–3, OTIS Mock AIME 2024–2025 and SimpleQA Verified), because Grok 4.7 has no Capabilities Index score yet.

Which is cheaper, Claude Opus 5.5 or Grok 4.7?

Grok 4.7 is cheaper at $2.00 input / $6.00 output per million tokens (official xAI API price). Claude Opus 5.5 costs $4.00 input / $20.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $3.00 per million tokens for Grok 4.7 versus $8.00 for Claude Opus 5.5 (2.7× as much).

Which scores higher on benchmarks?

Not every model here has a Capabilities Index score, so we compare the average of shared benchmarks (GPQA Diamond, FrontierMath Tiers 1–3, OTIS Mock AIME 2024–2025 and SimpleQA Verified): Claude Opus 5.5 88.5% and Grok 4.7 74.9%. On individual benchmarks: GPQA Diamond — Grok 4.7 92.7%, Claude Opus 5.5 90.6%; FrontierMath Tiers 1–3 — Claude Opus 5.5 91.2%, Grok 4.7 53.0%; OTIS Mock AIME 2024–2025 — Claude Opus 5.5 100%, Grok 4.7 98.1%; SimpleQA Verified — Claude Opus 5.5 72.2%, Grok 4.7 56.0%.

Which is better for coding?

There are no published SWE-bench Verified results for Claude Opus 5.5 and Grok 4.7 yet, so there is no like-for-like coding score. On overall capability, Claude Opus 5.5 leads, which tends to carry over to coding, but test on your own codebase. Both support tool calling for agent workflows.

Which has the bigger context window?

Claude Opus 5.5 has the largest context window at 1,000,000 tokens, against 500,000 for Grok 4.7. Maximum output per response: Claude Opus 5.5 up to 128,000, Grok 4.7 up to 500,000 tokens.

Which can read images, PDFs, audio or video?

Claude Opus 5.5 accepts text, images and PDFs; Grok 4.7 accepts text, images and PDFs. They handle the same number of input types.

Are any of these open source?

No. Claude Opus 5.5 and Grok 4.7 are proprietary and only available through APIs and apps.

Which is newer?

Claude Opus 5.5 is the newest, released Sep 22, 2026. Grok 4.7 came out Sep 21, 2026. Knowledge cutoff: Claude Opus 5.5 Jun 2026, Grok 4.7 May 2026.

How do you decide the winner?

Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Oct 4, 2026.

05 — Keep comparing

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