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Comparison · 2 models · Updated Oct 4, 2026

Gemini 3 Pro Preview vs Claude Opus 4.5

Gemini 3 Pro Preview comes out ahead, 67 to 55 on our weighted score, and it is the cheaper option too.

  1. Our pick

    Google

    Gemini 3 Pro Preview

    Released Nov 18, 2025

    67/100
    • ECI153.0
    • Price$2.00 / $12.00
    • Context1.05M
    Full specs Remove Gemini 3 Pro Preview

  2. 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

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Gemini 3 Pro Preview is our pick

Gemini 3 Pro Preview is the better all-round choice, scoring 67/100 against Claude Opus 4.5 (55). It leads on capability, price, inputs & features and context window. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityGemini 3 Pro PreviewCapabilities Index (ECI): Gemini 3 Pro Preview 153.0 · Claude Opus 4.5 150.1
  • Lowest priceGemini 3 Pro PreviewGemini 3 Pro Preview $4.50 · Claude Opus 4.5 $10.00 per 1M tokens (3:1 blend)
  • Longest contextGemini 3 Pro PreviewGemini 3 Pro Preview 1,048,576 · Claude Opus 4.5 200,000 tokens
  • Widest inputsGemini 3 Pro PreviewGemini 3 Pro Preview: Text, Images, PDFs, Audio, Video · Claude Opus 4.5: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGemini 3 Pro PreviewClaude Opus 4.5
CapabilityCapabilities Index (ECI)50%8278
Price25%192
Inputs & features15%10080
Context window10%6132
Overall100%67/10055/100
02 — Side by side

Every spec in one table

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

Gemini 3 Pro Preview vs Claude Opus 4.5 specifications side by side
SpecificationGemini 3 Pro PreviewGoogleClaude Opus 4.5Anthropic
Capability
Capabilities Index (ECI)153.0 (best)150.1
ECI rank#39 of 148 (best)#48 of 148
GPQA DiamondGraduate-level science questions92.6% (best)86.1%
FrontierMath Tiers 1–3Research-level mathematics—34.4%
OTIS Mock AIME 2024–2025Competition mathematics91.4% (best)86.1%
SWE-bench VerifiedFixing real GitHub issues72.9%76.7% (best)
SimpleQA VerifiedShort factual questions—45.7%
Price per million tokens
Input$2.00 (best)$5.00
Output$12.00 (best)$25.00
Cached input—$0.50
Blended (3:1)$4.50 (best)$10.00
Long-context rateSame rateSame rate
Price sourceMedian of 2 providersOfficial Anthropic API
Limits
Context window1,048,576 tokens (best)200,000 tokens
Max output65,536 tokens (best)64,000 tokens
Inputs and features
TextYesYes
ImagesYesYes
PDFsYesYes
AudioYesNo
VideoYesNo
ReasoningYesYeslow · medium · high
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model ID—claude-opus-4-5
API providers328 (best)
ReleasedNov 18, 2025Nov 24, 2025
Knowledge cutoffJan 2025May 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.

  • Gemini 3 Pro Preview$44.00
  • Claude Opus 4.5$100.00
04 — Questions

Which should you choose?

Which is better: Gemini 3 Pro Preview or Claude Opus 4.5?

Gemini 3 Pro Preview is the better all-round choice, scoring 67/100 against Claude Opus 4.5 (55). 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, Gemini 3 Pro Preview or Claude Opus 4.5?

Gemini 3 Pro Preview is cheaper at $2.00 input / $12.00 output per million tokens (median across 2 API providers). 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 $4.50 per million tokens for Gemini 3 Pro Preview versus $10.00 for Claude Opus 4.5 (2.2× as much).

Which scores higher on benchmarks?

Gemini 3 Pro Preview scores higher on the Capabilities Index (ECI): Gemini 3 Pro Preview 153.0 (#39 of 148) and Claude Opus 4.5 150.1 (#48 of 148). The confidence ranges of the top two overlap (150.6–155.2 vs 147.9–153.0), so treat the gap as small. On individual benchmarks: GPQA Diamond — Gemini 3 Pro Preview 92.6%, Claude Opus 4.5 86.1%; OTIS Mock AIME 2024–2025 — Gemini 3 Pro Preview 91.4%, Claude Opus 4.5 86.1%; SWE-bench Verified — Claude Opus 4.5 76.7%, Gemini 3 Pro Preview 72.9%.

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 Gemini 3 Pro Preview 72.9%. Both support tool calling for agent workflows.

Which has the bigger context window?

Gemini 3 Pro Preview has the largest context window at 1,048,576 tokens, against 200,000 for Claude Opus 4.5. Maximum output per response: Gemini 3 Pro Preview up to 65,536, Claude Opus 4.5 up to 64,000 tokens.

Which can read images, PDFs, audio or video?

Gemini 3 Pro Preview accepts text, images, PDFs, audio and video; Claude Opus 4.5 accepts text, images and PDFs. Gemini 3 Pro Preview handles the widest range of inputs.

Are any of these open source?

No. Gemini 3 Pro Preview and Claude Opus 4.5 are proprietary and only available through APIs and apps.

Which is newer?

Claude Opus 4.5 is the newest, released Nov 24, 2025. Gemini 3 Pro Preview came out Nov 18, 2025. Knowledge cutoff: Gemini 3 Pro Preview Jan 2025, Claude Opus 4.5 May 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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