WhichAI / Models / Claude Opus 4.5

Claude Opus 4.5

· verified October 14, 2026

legacy paid api coding

Provider

Statuslegacy

AA Intelligence Index29.1 (official, read October 14, 2026)

Released2025-11-24

Context window200K

Modalitiesn/a

API price $/1M (in / out)$5 / $25 (OpenRouter)

Speedn/a

AccessAPI (legacy)

In one line

The late-2025 flagship that made agentic coding mainstream; now two generations back.

Coding72

Reasoning70

Writing70

Agents & tools68

Category scores (0-100) are WhichAI blended ratings: public category leaderboards plus editorial judgment. Guidance, not official measurements.

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Artificial Analysis Intelligence Index, official scale (the number published on artificialanalysis.ai), relayed by OpenRouter and refreshed automatically: last read October 14, 2026. 209 models carry a current official measurement. A value marked ~ is converted from an earlier snapshot because no current measurement is published; an unmeasured model is never ranked. Context, price, modality and listing dates come from the public OpenRouter model list (refreshed automatically on the live site; static copy retrieved October 3, 2026) and vendor pages. Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (the Ranking chapter and About > Methodology).