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Comparison · 2 models · Updated Oct 4, 2026

Claude Opus 4.5 vs GPT-5.2

GPT-5.2 comes out ahead, 61 to 55 on our weighted score, and it is the cheaper option too.

  1. Anthropic

    Claude Opus 4.5

    Released Nov 24, 2025

    55/100
    • ECI150.1
    • Price$5.00 / $25.00
    • Context200K
    Full specs Remove Claude Opus 4.5
  2. Our pick

    OpenAI

    GPT-5.2

    Released Dec 11, 2025

    61/100
    • ECI153.5
    • Price$1.75 / $14.00
    • Context400K
    Full specs Remove GPT-5.2

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

GPT-5.2 is our pick

GPT-5.2 is the better all-round choice, scoring 61/100 against Claude Opus 4.5 (55). It leads on capability, price and context window. Claude Opus 4.5 wins on inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGPT-5.2Capabilities Index (ECI): GPT-5.2 153.5 · Claude Opus 4.5 150.1
  • Lowest priceGPT-5.2GPT-5.2 $4.81 · Claude Opus 4.5 $10.00 per 1M tokens (3:1 blend)
  • Longest contextGPT-5.2GPT-5.2 400,000 · Claude Opus 4.5 200,000 tokens
  • Widest inputsClaude Opus 4.5Claude Opus 4.5: Text, Images, PDFs · GPT-5.2: Text, Images
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightClaude Opus 4.5GPT-5.2
CapabilityCapabilities Index (ECI)50%7883
Price25%218
Inputs & features15%8070
Context window10%3244
Overall100%55/10061/100
02 — Side by side

Every spec in one table

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

Claude Opus 4.5 vs GPT-5.2 specifications side by side
SpecificationClaude Opus 4.5AnthropicGPT-5.2OpenAI
Capability
Capabilities Index (ECI)150.1153.5 (best)
ECI rank#48 of 148#38 of 148 (best)
GPQA DiamondGraduate-level science questions86.1%91.4% (best)
FrontierMath Tiers 1–3Research-level mathematics34.4%67.4% (best)
OTIS Mock AIME 2024–2025Competition mathematics86.1%96.1% (best)
SWE-bench VerifiedFixing real GitHub issues76.7% (best)73.8%
SimpleQA VerifiedShort factual questions45.7% (best)37.1%
Price per million tokens
Input$5.00$1.75 (best)
Output$25.00$14.00 (best)
Cached input$0.50$0.175 (best)
Blended (3:1)$10.00$4.81 (best)
Long-context rateSame rateSame rate
Price sourceOfficial Anthropic APIOfficial OpenAI API
Limits
Context window200,000 tokens400,000 tokens (best)
Max output64,000 tokens128,000 tokens (best)
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesNo
AudioNoNo
VideoNoNo
ReasoningYeslow · medium · highYeslow · medium · high · xhigh
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDclaude-opus-4-5gpt-5.2
API providers28 (best)21
ReleasedNov 24, 2025Dec 11, 2025
Knowledge cutoffMay 2025Aug 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 4.5$100.00
  • GPT-5.2$45.50
04 — Questions

Which should you choose?

Which is better: Claude Opus 4.5 or GPT-5.2?

GPT-5.2 is the better all-round choice, scoring 61/100 against Claude Opus 4.5 (55). It leads on capability, price and context window. Claude Opus 4.5 wins on inputs & features. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Claude Opus 4.5 or GPT-5.2?

GPT-5.2 is cheaper at $1.75 input / $14.00 output per million tokens (official OpenAI API price). Claude Opus 4.5 costs $5.00 input / $25.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $4.81 per million tokens for GPT-5.2 versus $10.00 for Claude Opus 4.5 (2.1× as much).

Which scores higher on benchmarks?

GPT-5.2 scores higher on the Capabilities Index (ECI): GPT-5.2 153.5 (#38 of 148) and Claude Opus 4.5 150.1 (#48 of 148). The confidence ranges of the top two overlap (151.7–155.4 vs 147.9–153.0), so treat the gap as small. On individual benchmarks: GPQA Diamond — GPT-5.2 91.4%, Claude Opus 4.5 86.1%; FrontierMath Tiers 1–3 — GPT-5.2 67.4%, Claude Opus 4.5 34.4%; OTIS Mock AIME 2024–2025 — GPT-5.2 96.1%, Claude Opus 4.5 86.1%; SWE-bench Verified — Claude Opus 4.5 76.7%, GPT-5.2 73.8%; SimpleQA Verified — Claude Opus 4.5 45.7%, GPT-5.2 37.1%.

Which is better for coding?

Claude Opus 4.5 resolves more real GitHub issues on SWE-bench Verified: Claude Opus 4.5 76.7% and GPT-5.2 73.8%. Both support tool calling for agent workflows.

Which has the bigger context window?

GPT-5.2 has the largest context window at 400,000 tokens, against 200,000 for Claude Opus 4.5. Maximum output per response: Claude Opus 4.5 up to 64,000, GPT-5.2 up to 128,000 tokens.

Which can read images, PDFs, audio or video?

Claude Opus 4.5 accepts text, images and PDFs; GPT-5.2 accepts text and images. Claude Opus 4.5 handles the widest range of inputs.

Are any of these open source?

No. Claude Opus 4.5 and GPT-5.2 are proprietary and only available through APIs and apps.

Which is newer?

GPT-5.2 is the newest, released Dec 11, 2025. Claude Opus 4.5 came out Nov 24, 2025. Knowledge cutoff: Claude Opus 4.5 May 2025, GPT-5.2 Aug 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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