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Comparison · 2 models · Updated Oct 4, 2026

Gemini 2.5 Pro vs Claude Sonnet 4.5

Gemini 2.5 Pro comes out ahead, 63 to 55 on our weighted score, and it is the cheaper option too.

  1. Our pick

    Google

    Gemini 2.5 Pro

    Released Jun 17, 2025

    63/100
    • ECI145.3
    • Price$1.25 / $10.00
    • Context1.05M
    Full specs Remove Gemini 2.5 Pro

  2. Anthropic

    Claude Sonnet 4.5

    Released Sep 29, 2025

    55/100
    • ECI146.8
    • Price$3.00 / $15.00
    • Context200K
    Full specs Remove Claude Sonnet 4.5

  3. Add a model

    Make it a three-way comparison.

01 — Verdict

Gemini 2.5 Pro is our pick

Gemini 2.5 Pro is the better all-round choice, scoring 63/100 against Claude Sonnet 4.5 (55). It leads on price, inputs & features and context window. Claude Sonnet 4.5 wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

  • CapabilityClaude Sonnet 4.5Capabilities Index (ECI): Claude Sonnet 4.5 146.8 · Gemini 2.5 Pro 145.3
  • Lowest priceGemini 2.5 ProGemini 2.5 Pro $3.44 · Claude Sonnet 4.5 $6.00 per 1M tokens (3:1 blend)
  • Longest contextGemini 2.5 ProGemini 2.5 Pro 1,048,576 · Claude Sonnet 4.5 200,000 tokens
  • Widest inputsGemini 2.5 ProGemini 2.5 Pro: Text, Images, PDFs, Audio, Video · Claude Sonnet 4.5: Text, Images, PDFs
  • Self-hostingNo open weightsBoth are available only through APIs
How the score is built
MeasureWeightGemini 2.5 ProClaude Sonnet 4.5
CapabilityCapabilities Index (ECI)50%7274
Price25%2413
Inputs & features15%10080
Context window10%6132
Overall100%63/10055/100
02 — Side by side

Every spec in one table

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

Gemini 2.5 Pro vs Claude Sonnet 4.5 specifications side by side
SpecificationGemini 2.5 ProGoogleClaude Sonnet 4.5Anthropic
Capability
Capabilities Index (ECI)145.3146.8 (best)
ECI rank#78 of 148#64 of 148 (best)
GPQA DiamondGraduate-level science questions85.3% (best)82.3%
FrontierMath Tiers 1–3Research-level mathematics24.6% (best)23.9%
OTIS Mock AIME 2024–2025Competition mathematics84.7% (best)77.8%
SWE-bench VerifiedFixing real GitHub issues57.6%71.3% (best)
SimpleQA VerifiedShort factual questions—30.7%
Price per million tokens
Input$1.25 (best)$3.00
Output$10.00 (best)$15.00
Cached input$0.125 (best)$0.30
Blended (3:1)$3.44 (best)$6.00
Long-context rateOver 200K: $2.50 / $15.00Same rate
Price sourceOfficial Google APIOfficial 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
ReasoningYesYes
Tool callingYesYes
Structured outputYesYes
Availability
WeightsProprietaryProprietary
API model IDgemini-2.5-proclaude-sonnet-4-5
API providers2228 (best)
ReleasedJun 17, 2025Sep 29, 2025
Knowledge cutoffJan 2025Jul 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.

  • Gemini 2.5 Pro$32.50
  • Claude Sonnet 4.5$60.00
04 — Questions

Which should you choose?

Which is better: Gemini 2.5 Pro or Claude Sonnet 4.5?

Gemini 2.5 Pro is the better all-round choice, scoring 63/100 against Claude Sonnet 4.5 (55). It leads on price, inputs & features and context window. Claude Sonnet 4.5 wins on capability. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.

Which is cheaper, Gemini 2.5 Pro or Claude Sonnet 4.5?

Gemini 2.5 Pro is cheaper at $1.25 input / $10.00 output per million tokens (official Google API price). Claude Sonnet 4.5 costs $3.00 input / $15.00 output per million tokens (official Anthropic API price). At a typical mix of three input tokens to one output token, that is $3.44 per million tokens for Gemini 2.5 Pro versus $6.00 for Claude Sonnet 4.5 (1.7× as much).

Which scores higher on benchmarks?

Claude Sonnet 4.5 scores higher on the Capabilities Index (ECI): Claude Sonnet 4.5 146.8 (#64 of 148) and Gemini 2.5 Pro 145.3 (#78 of 148). The confidence ranges of the top two overlap (145.3–148.5 vs 143.6–146.9), so treat the gap as small. On individual benchmarks: GPQA Diamond — Gemini 2.5 Pro 85.3%, Claude Sonnet 4.5 82.3%; FrontierMath Tiers 1–3 — Gemini 2.5 Pro 24.6%, Claude Sonnet 4.5 23.9%; OTIS Mock AIME 2024–2025 — Gemini 2.5 Pro 84.7%, Claude Sonnet 4.5 77.8%; SWE-bench Verified — Claude Sonnet 4.5 71.3%, Gemini 2.5 Pro 57.6%.

Which is better for coding?

Claude Sonnet 4.5 resolves more real GitHub issues on SWE-bench Verified: Claude Sonnet 4.5 71.3% and Gemini 2.5 Pro 57.6%. Both support tool calling for agent workflows.

Which has the bigger context window?

Gemini 2.5 Pro has the largest context window at 1,048,576 tokens, against 200,000 for Claude Sonnet 4.5. Maximum output per response: Gemini 2.5 Pro up to 65,536, Claude Sonnet 4.5 up to 64,000 tokens.

Which can read images, PDFs, audio or video?

Gemini 2.5 Pro accepts text, images, PDFs, audio and video; Claude Sonnet 4.5 accepts text, images and PDFs. Gemini 2.5 Pro handles the widest range of inputs.

Are any of these open source?

No. Gemini 2.5 Pro and Claude Sonnet 4.5 are proprietary and only available through APIs and apps.

Which is newer?

Claude Sonnet 4.5 is the newest, released Sep 29, 2025. Gemini 2.5 Pro came out Jun 17, 2025. Knowledge cutoff: Gemini 2.5 Pro Jan 2025, Claude Sonnet 4.5 Jul 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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