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Comparison · 3 models · Updated Oct 4, 2026

Claude Opus 4 vs Claude Opus 4.1 vs o3-pro

Too close to call on our weighted score (o3-pro 51, Claude Opus 4.1 49, Claude Opus 4 48). The right pick depends on what you value most.

  1. Anthropic

    Claude Opus 4

    Released May 22, 2025

    48/100
    • ECI142.7
    • Price$15.00 / $75.00
    • Context200K
    Full specs Remove Claude Opus 4

  2. 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

  3. OpenAI

    o3-pro

    Released Jun 10, 2025

    51/100
    • ECI147.4
    • Price$20.00 / $80.00
    • Context200K
    Full specs Remove o3-pro
01 — Verdict

Too close to call

It is close. Our weighted score puts them within 2 points (o3-pro 51/100, Claude Opus 4.1 49/100, Claude Opus 4 48/100), so choose by what matters most for your work: o3-pro for raw capability and Claude Opus 4 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • Capabilityo3-proCapabilities Index (ECI): o3-pro 147.4 · Claude Opus 4.1 144.1 · Claude Opus 4 142.7
  • Lowest priceClaude Opus 4 and Claude Opus 4.1Claude Opus 4 $30.00 · Claude Opus 4.1 $30.00 · o3-pro $35.00 per 1M tokens (3:1 blend)
  • Longest contextAbout the sameClaude Opus 4 200,000 · Claude Opus 4.1 200,000 · o3-pro 200,000 tokens
  • Widest inputsClaude Opus 4 and Claude Opus 4.1Claude Opus 4: Text, Images, PDFs · Claude Opus 4.1: Text, Images, PDFs · o3-pro: Text, Images
  • Self-hostingNo open weightsAll three are available only through APIs
How the score is built
MeasureWeightClaude Opus 4Claude Opus 4.1o3-pro
CapabilityCapabilities Index (ECI)50%697175
Price25%000
Inputs & features15%707070
Context window10%323232
Overall100%48/10049/10051/100
02 — Side by side

Every spec in one table

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

Claude Opus 4 vs Claude Opus 4.1 vs o3-pro specifications side by side
SpecificationClaude Opus 4AnthropicClaude Opus 4.1Anthropico3-proOpenAI
Capability
Capabilities Index (ECI)142.7144.1147.4 (best)
ECI rank#87 of 148#81 of 148#60 of 148 (best)
GPQA DiamondGraduate-level science questions76.3%77.3% (best)—
FrontierMath Tiers 1–3Research-level mathematics—12.6%—
OTIS Mock AIME 2024–2025Competition mathematics64.4%68.9% (best)—
SWE-bench VerifiedFixing real GitHub issues70.7%73.4% (best)—
Price per million tokens
Input$15.00 (best)$15.00 (best)$20.00
Output$75.00 (best)$75.00 (best)$80.00
Cached input———
Blended (3:1)$30.00 (best)$30.00 (best)$35.00
Long-context rateSame rateSame rateSame rate
Price sourceMedian of 5 providersMedian of 14 providersOfficial OpenAI API
Limits
Context window200,000 tokens200,000 tokens200,000 tokens
Max output32,000 tokens32,000 tokens100,000 tokens (best)
Inputs and features
TextYesYesYes
ImagesYesYesYes
PDFsYesYesNo
AudioNoNoNo
VideoNoNoNo
ReasoningYesYesYeslow · medium · high
Tool callingYesYesYes
Structured outputNoNoYes
Availability
WeightsProprietaryProprietaryProprietary
API model ID——o3-pro
API providers514 (best)6
ReleasedMay 22, 2025Aug 5, 2025Jun 10, 2025
Knowledge cutoffMar 31, 2025Mar 31, 2025May 2024
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$300.00
  • Claude Opus 4.1$300.00
  • o3-pro$360.00
04 — Questions

Which should you choose?

Which is better: Claude Opus 4, Claude Opus 4.1 or o3-pro?

It is close. Our weighted score puts them within 2 points (o3-pro 51/100, Claude Opus 4.1 49/100, Claude Opus 4 48/100), so choose by what matters most for your work: o3-pro for raw capability and Claude Opus 4 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Claude Opus 4, Claude Opus 4.1 or o3-pro?

Claude Opus 4 is cheaper at $15.00 input / $75.00 output per million tokens (median across 5 API providers). Claude Opus 4.1 costs $15.00 input / $75.00 output per million tokens (median across 14 API providers); o3-pro costs $20.00 input / $80.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $30.00 per million tokens for Claude Opus 4 versus $30.00 for Claude Opus 4.1 (1× as much) and $35.00 for o3-pro (1.2× as much).

Which scores higher on benchmarks?

o3-pro scores higher on the Capabilities Index (ECI): o3-pro 147.4 (#60 of 148), Claude Opus 4.1 144.1 (#81 of 148) and Claude Opus 4 142.7 (#87 of 148). The confidence ranges of the top two overlap (145.8–149.7 vs 141.6–146.0), so treat the gap as small.

Which is better for coding?

There are no published SWE-bench Verified results for o3-pro yet, so there is no like-for-like coding score. On overall capability, o3-pro leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.

Which has the bigger context window?

Claude Opus 4, Claude Opus 4.1 and o3-pro share the same 200,000-token context window. Maximum output per response: Claude Opus 4 up to 32,000, Claude Opus 4.1 up to 32,000, o3-pro up to 100,000 tokens.

Which can read images, PDFs, audio or video?

Claude Opus 4 accepts text, images and PDFs; Claude Opus 4.1 accepts text, images and PDFs; o3-pro accepts text and images. Claude Opus 4 handles the widest range of inputs.

Are any of these open source?

No. Claude Opus 4, Claude Opus 4.1 and o3-pro are proprietary and only available through APIs and apps.

Which is newer?

Claude Opus 4.1 is the newest, released Aug 5, 2025. o3-pro came out Jun 10, 2025; Claude Opus 4 came out May 22, 2025. Knowledge cutoff: Claude Opus 4 Mar 31, 2025, Claude Opus 4.1 Mar 31, 2025, o3-pro May 2024.

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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