WhichAI / Models / Claude Sonnet 5

Claude Sonnet 5

· verified October 14, 2026

public free api in Generator writing coding value

Provider

Statuspublic

AA Intelligence Index38.2 (official, read October 14, 2026)

Released2026-06-30

Context window1M

Modalitiesn/a

API price $/1M (in / out)$2 / $10 (OpenRouter) · the $2/$10 introductory API price expired Aug 31, 2026

Speedn/a

AccessFREE tier of claude.ai · API

In one line

The strongest free option on the market - frontier-adjacent writing and coding quality at zero cost. Best zero-budget daily driver for text work.

Coding84

Reasoning82

Writing86

Agents & tools80

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

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Head-to-head: Claude Sonnet 5 vs GPT-5.5

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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).