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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.

SpecificationClaude Sonnet 4.5AnthropicClaude Opus 5Anthropic
ReleasedSep 29, 2025Jul 24, 2026
Context window1M1M
Max output64K128K
Input / 1M$3$5
Output / 1M$15$25
Cost per task$1.35$2.25
Arena Elo1,2131,393
Serving providers45
ParametersUndisclosedUndisclosed
LicenceProprietaryProprietary
Capabilities
  • Reasoning
  • Tool use
  • Vision
  • 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

  • Claude Sonnet 4.5
  • Claude Opus 5

  • Intelligence Index

    Claude Sonnet 4.5
    29.9
    Claude Opus 5
    63.1

  • Coding Index

    Claude Sonnet 4.5not measured
    Claude Opus 5
    78.0

  • Agentic Index

    Claude Sonnet 4.5
    26.4
    Claude Opus 5
    59.2

  • Output speed

    Claude Sonnet 4.5
    54 t/s
    Claude Opus 5
    87 t/s

  • Context window

    Claude Sonnet 4.5
    1M
    Claude Opus 5
    1M

  • Latency · lower is better

    Claude Sonnet 4.5
    1.1s
    Claude Opus 5
    1.12s

  • Blended price / 1M · lower is better

    Claude Sonnet 4.5
    $6
    Claude Opus 5
    $10

  • Cost per task · lower is better

    Claude Sonnet 4.5
    $1.35
    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
MetricClaude Sonnet 4.5Claude Opus 5
Intelligence Index29.963.1
Coding Index—78.0
Agentic Index26.459.2
Output speed54 t/s87 t/s
Context window1M1M
Latency · lower is better1.1s1.12s
Blended price / 1M · lower is better$6$10
Cost per task · lower is better$1.35$2.25

Evaluation scores

Percentage correct on a common 0–100% scale

  • Claude Sonnet 4.5
  • Claude Opus 5

  • GPQA Diamond

    Claude Sonnet 4.5
    72.7%
    Claude Opus 5
    93.2%

  • Humanity's Last Exam

    Claude Sonnet 4.5
    7.2%
    Claude Opus 5
    54.9%

  • SciCode

    Claude Sonnet 4.5
    42.8%
    Claude Opus 5
    55.7%

  • τ²-bench

    Claude Sonnet 4.5
    70.5%
    Claude Opus 5
    42.1%

  • Terminal-Bench Hard

    Claude Sonnet 4.5
    28.8%
    Claude Opus 5not measured

  • LiveCodeBench

    Claude Sonnet 4.5
    59.0%
    Claude Opus 5not measured

  • AA-LCR long context

    Claude Sonnet 4.5
    52.3%
    Claude Opus 5
    75.7%

  • AIME 2025

    Claude Sonnet 4.5
    37.0%
    Claude Opus 5not measured

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

View as table
EvaluationClaude Sonnet 4.5Claude Opus 5
GPQA Diamond72.7%93.2%
Humanity's Last Exam7.2%54.9%
SciCode42.8%55.7%
τ²-bench70.5%42.1%
Terminal-Bench Hard28.8%—
LiveCodeBench59.0%—
AA-LCR long context52.3%75.7%
AIME 202537.0%—

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