WhichAI / Models / Claude Opus 5.5

Claude Opus 5.5

· verified October 3, 2026

public paid api reasoning vision long-context

Provider

Statuspublic

AA Intelligence Index57.6 (official, read October 3, 2026)

Released2026-09-22

Context window1M

ModalitiesText + image + files

API price $/1M (in / out)$4 / $20 (OpenRouter)

Speedn/a

AccessAPI $4/$20 per 1M tokens on OpenRouter · listed September 22, 2026

In one line

Claude Opus 5.5 by Anthropic, measured by Artificial Analysis at 57.6 on the Intelligence Index. Added to WhichAI automatically from live data on October 3, 2026: no editorial review yet, so judge it by the numbers, not by a verdict. OpenRouter's description: “Claude Opus 5.5 is Anthropic's flagship model for demanding reasoning, coding, and long-horizon agentic work, succeeding Claude Opus 5.”

Alternatives worth a look

Claude Sonnet 5.5 (Anthropic) · AA 56API $2/$10 per 1M tokens on OpenRouter · listed September 28, 2026
Claude Fable 5.1 (Anthropic) · AA 53.4Released September 1, 2026 · Claude Pro and Max · API $10/$50 per 1M tokens ($0.25 cached)
GPT-6 Astra (OpenAI) · AA 52.7Released September 4, 2026 · API $10/$50 per 1M tokens ($1 cached) · ChatGPT Plus and Pro · batch tier at $5/$25

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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 3, 2026. 97 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 (Model guide and About > Methodology).