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Four models, one page

Pick the models you are actually choosing between. Every row is scaled within itself, so a bar means something next to its neighbours and nothing across rows.

SpecificationGemini 3.1 Pro Preview Custom ToolsGoogleClaude Opus 5Anthropic
ReleasedFeb 25, 2026Jul 24, 2026
Context window1.05M1M
Max output66K128K
Input / 1M$2$5
Output / 1M$12$25
Cost per task$1.06$2.25
Arena Elo—1,393
Serving providers15
ParametersUndisclosedUndisclosed
LicenceProprietaryProprietary
Capabilities
  • Reasoning
  • Tool use
  • Vision
  • Audio in
  • Video in
  • Reasoning
  • Tool use
  • Vision

Metrics side by side

Each row is scaled to the largest value in that row — bars compare within a row, never across rows

  • Gemini 3.1 Pro Preview Custom Tools
  • Claude Opus 5

  • Intelligence Index

    Gemini 3.1 Pro Preview Custom Toolsnot measured
    Claude Opus 5
    63.1

  • Coding Index

    Gemini 3.1 Pro Preview Custom Toolsnot measured
    Claude Opus 5
    78.0

  • Agentic Index

    Gemini 3.1 Pro Preview Custom Toolsnot measured
    Claude Opus 5
    59.2

  • Output speed

    Gemini 3.1 Pro Preview Custom Tools
    59 t/s
    Claude Opus 5
    87 t/s

  • Context window

    Gemini 3.1 Pro Preview Custom Tools
    1.05M
    Claude Opus 5
    1M

  • Latency · lower is better

    Gemini 3.1 Pro Preview Custom Tools
    3.7s
    Claude Opus 5
    1.12s

  • Blended price / 1M · lower is better

    Gemini 3.1 Pro Preview Custom Tools
    $4.5
    Claude Opus 5
    $10

  • Cost per task · lower is better

    Gemini 3.1 Pro Preview Custom Tools
    $1.06
    Claude Opus 5
    $2.25

Rows marked “lower is better” still draw a longer bar for a larger number — read the value, not just the length. Arena Elo is in the specification table above instead: it has no meaningful zero, so a bar would flatten the gaps.

View as table
MetricGemini 3.1 Pro Preview Custom ToolsClaude Opus 5
Intelligence Index—63.1
Coding Index—78.0
Agentic Index—59.2
Output speed59 t/s87 t/s
Context window1.05M1M
Latency · lower is better3.7s1.12s
Blended price / 1M · lower is better$4.5$10
Cost per task · lower is better$1.06$2.25

Evaluation scores

Percentage correct on a common 0–100% scale

  • Gemini 3.1 Pro Preview Custom Tools
  • Claude Opus 5

  • GPQA Diamond

    Gemini 3.1 Pro Preview Custom Toolsnot measured
    Claude Opus 5
    93.2%

  • Humanity's Last Exam

    Gemini 3.1 Pro Preview Custom Toolsnot measured
    Claude Opus 5
    54.9%

  • SciCode

    Gemini 3.1 Pro Preview Custom Toolsnot measured
    Claude Opus 5
    55.7%

  • τ²-bench

    Gemini 3.1 Pro Preview Custom Toolsnot measured
    Claude Opus 5
    42.1%

  • AA-LCR long context

    Gemini 3.1 Pro Preview Custom Toolsnot measured
    Claude Opus 5
    75.7%

A missing bar means that evaluation was not run for that model — it is not a zero.

View as table
EvaluationGemini 3.1 Pro Preview Custom ToolsClaude Opus 5
GPQA Diamond—93.2%
Humanity's Last Exam—54.9%
SciCode—55.7%
τ²-bench—42.1%
Terminal-Bench Hard——
LiveCodeBench——
AA-LCR long context—75.7%
AIME 2025——

Estimated from list pricing: 50K input tokens plus 80K output tokens for reasoning models (25K for non-reasoning).