WhichAI / Models / Claude Sonnet 5

Claude Sonnet 5

· verified September 8, 2026

public free api in Generator writing coding value

Provider

Statuspublic

AA Intelligence Index55.3 (September 8, 2026 snapshot)

Releasedn/a

Context window1M

Modalitiesn/a

API price $/1M (in / out)$3 / $15 · 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.

Alternatives worth a look

Grok 4.5 (xAI) · AA 55.8Released July 8, 2026 · API $2/$6 per 1M tokens · in Grok Build & Cursor · not yet in the EU
Gemini 3.7 Flash (Google) · AA 56Released August 13, 2026 · API $0.75/$3.75 per 1M tokens (introductory, doubles Jan 1, 2027) · model id gemini-3.7-flash · free-tier availability not confirmed
GPT-5.5 (OpenAI) · AA 56.3Free (limited messages) · Plus $20/mo · Go ~$8/mo · API

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

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Artificial Analysis Intelligence Index, 2026 rebased scale (top models ~ 55-66). Snapshot: September 4, 2026 (BenchLM mirror), retrieved September 8, 2026. Specs and prices come from the OpenRouter public model list on the same date. Models nobody has measured carry no index score at all and never enter a ranking: where an estimate exists it is shown separately and labelled unmeasured. Context, price, modality and release dates come from the public OpenRouter model list (retrieved September 8, 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).