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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.

SpecificationReka Flash 3Reka AIClaude Opus 5Anthropic
ReleasedMar 12, 2025Jul 24, 2026
Context window66K1M
Max output66K128K
Input / 1M$0.1$5
Output / 1M$0.2$25
Cost per task$0.02$2.25
Arena Elo—1,393
Serving providers15
Parameters20.9BUndisclosed
Licenceapache-2.0Proprietary
Capabilities
  • Reasoning
  • Open weights
  • 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

  • Reka Flash 3
  • Claude Opus 5

  • Intelligence Index

    Reka Flash 3
    3.7
    Claude Opus 5
    63.1

  • Coding Index

    Reka Flash 3not measured
    Claude Opus 5
    78.0

  • Agentic Index

    Reka Flash 3not measured
    Claude Opus 5
    59.2

  • Output speed

    Reka Flash 3
    90 t/s
    Claude Opus 5
    87 t/s

  • Context window

    Reka Flash 3
    66K
    Claude Opus 5
    1M

  • Latency · lower is better

    Reka Flash 3
    1.21s
    Claude Opus 5
    1.12s

  • Blended price / 1M · lower is better

    Reka Flash 3
    $0.125
    Claude Opus 5
    $10

  • Cost per task · lower is better

    Reka Flash 3
    $0.02
    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
MetricReka Flash 3Claude Opus 5
Intelligence Index3.763.1
Coding Index—78.0
Agentic Index—59.2
Output speed90 t/s87 t/s
Context window66K1M
Latency · lower is better1.21s1.12s
Blended price / 1M · lower is better$0.125$10
Cost per task · lower is better$0.02$2.25

Evaluation scores

Percentage correct on a common 0–100% scale

  • Reka Flash 3
  • Claude Opus 5

  • GPQA Diamond

    Reka Flash 3
    52.9%
    Claude Opus 5
    93.2%

  • Humanity's Last Exam

    Reka Flash 3
    4.4%
    Claude Opus 5
    54.9%

  • SciCode

    Reka Flash 3
    26.7%
    Claude Opus 5
    55.7%

  • τ²-bench

    Reka Flash 3
    0.0%
    Claude Opus 5
    42.1%

  • Terminal-Bench Hard

    Reka Flash 3
    0.0%
    Claude Opus 5not measured

  • LiveCodeBench

    Reka Flash 3
    43.5%
    Claude Opus 5not measured

  • AA-LCR long context

    Reka Flash 3
    0.0%
    Claude Opus 5
    75.7%

  • AIME 2025

    Reka Flash 3
    33.7%
    Claude Opus 5not measured

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

View as table
EvaluationReka Flash 3Claude Opus 5
GPQA Diamond52.9%93.2%
Humanity's Last Exam4.4%54.9%
SciCode26.7%55.7%
τ²-bench0.0%42.1%
Terminal-Bench Hard0.0%—
LiveCodeBench43.5%—
AA-LCR long context0.0%75.7%
AIME 202533.7%—

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