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Comparison · 2 models · Updated Oct 4, 2026

Claude Opus 4.1 vs Grok 4.3

Grok 4.3 comes out ahead, 67 to 49 on our weighted score, and it is the cheaper option too.

  1. Anthropic

    Claude Opus 4.1

    Released Aug 5, 2025

    49/100
    • ECI144.1
    • Price$15.00 / $75.00
    • Context200K
    Full specs Remove Claude Opus 4.1
  2. Our pick

    xAI

    Grok 4.3

    Released Apr 17, 2026

    67/100
    • ECI149.2
    • Price$1.25 / $2.50
    • Context1M
    Full specs Remove Grok 4.3

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Grok 4.3 is our pick

Grok 4.3 is the better all-round choice, scoring 67/100 against Claude Opus 4.1 (49). It leads on capability, price, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGrok 4.3Capabilities Index (ECI): Grok 4.3 149.2 · Claude Opus 4.1 144.1
  • Lowest priceGrok 4.3Grok 4.3 $1.56 · Claude Opus 4.1 $30.00 per 1M tokens (3:1 blend)
  • Longest contextGrok 4.3Grok 4.3 1,000,000 · Claude Opus 4.1 200,000 tokens
  • Widest inputsSame inputsClaude Opus 4.1: Text, Images, PDFs · Grok 4.3: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightClaude Opus 4.1Grok 4.3
CapabilityCapabilities Index (ECI)50%7177
Price25%041
Inputs & features15%7080
Context window10%3260
Overall100%49/10067/100
02 — Side by side

Every spec in one table

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

Claude Opus 4.1 vs Grok 4.3 specifications side by side
SpecificationClaude Opus 4.1AnthropicGrok 4.3xAI
Capability
Capabilities Index (ECI)144.1149.2 (best)
ECI rank#81 of 148#55 of 148 (best)
GPQA DiamondGraduate-level science questions77.3%88.8% (best)
FrontierMath Tiers 1–3Research-level mathematics12.6%42.8% (best)
OTIS Mock AIME 2024–2025Competition mathematics68.9%93.3% (best)
SWE-bench VerifiedFixing real GitHub issues73.4%—
SimpleQA VerifiedShort factual questions—33.2%
Price per million tokens
Input$15.00$1.25 (best)
Output$75.00$2.50 (best)
Cached input—$0.20
Blended (3:1)$30.00$1.56 (best)
Long-context rateSame rateOver 200K: $2.50 / $5.00
Price sourceMedian of 14 providersOfficial xAI API
Limits
Context window200,000 tokens1,000,000 tokens (best)
Max output32,000 tokens (best)30,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesYes
AudioNoNo
VideoNoNo
ReasoningYesYeslow · medium · high
Tool callingYesYes
Structured outputNoYes
Availability
WeightsProprietaryProprietary
API model ID—grok-4.3
API providers1427 (best)
ReleasedAug 5, 2025Apr 17, 2026
Knowledge cutoffMar 31, 2025—
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 4.1$300.00
  • Grok 4.3$17.50
04 — Questions

Which should you choose?

Which is better: Claude Opus 4.1 or Grok 4.3?

Grok 4.3 is the better all-round choice, scoring 67/100 against Claude Opus 4.1 (49). It leads on capability, price, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Claude Opus 4.1 or Grok 4.3?

Grok 4.3 is cheaper at $1.25 input / $2.50 output per million tokens (official xAI API price). Claude Opus 4.1 costs $15.00 input / $75.00 output per million tokens (median across 14 API providers). At a typical mix of three input tokens to one output token, that is $1.56 per million tokens for Grok 4.3 versus $30.00 for Claude Opus 4.1 (19× as much).

Which scores higher on benchmarks?

Grok 4.3 scores higher on the Capabilities Index (ECI): Grok 4.3 149.2 (#55 of 148) and Claude Opus 4.1 144.1 (#81 of 148). Their confidence ranges do not overlap (147.6–150.8 vs 141.6–146.0), so the gap is a real one. On individual benchmarks: GPQA Diamond — Grok 4.3 88.8%, Claude Opus 4.1 77.3%; FrontierMath Tiers 1–3 — Grok 4.3 42.8%, Claude Opus 4.1 12.6%; OTIS Mock AIME 2024–2025 — Grok 4.3 93.3%, Claude Opus 4.1 68.9%.

Which is better for coding?

There are no published SWE-bench Verified results for Grok 4.3 yet, so there is no like-for-like coding score. On overall capability, Grok 4.3 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?

Grok 4.3 has the largest context window at 1,000,000 tokens, against 200,000 for Claude Opus 4.1. Maximum output per response: Claude Opus 4.1 up to 32,000, Grok 4.3 up to 30,000 tokens.

Which can read images, PDFs, audio or video?

Claude Opus 4.1 accepts text, images and PDFs; Grok 4.3 accepts text, images and PDFs. They handle the same number of input types.

Are any of these open source?

No. Claude Opus 4.1 and Grok 4.3 are proprietary and only available through APIs and apps.

Which is newer?

Grok 4.3 is the newest, released Apr 17, 2026. Claude Opus 4.1 came out Aug 5, 2025. Knowledge cutoff: Claude Opus 4.1 Mar 31, 2025.

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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