WhichAI / Models / Claude Opus 5

Claude Opus 5

· verified September 8, 2026

public paid api in Generator reasoning coding agents long-context

Provider

Statuspublic

AA Intelligence Index63 (September 8, 2026 snapshot)

Released2026-07-24

Context window1M

ModalitiesText + vision

API price $/1M (in / out)$5 / $25 · cache hits $0.50/M; Batch -50%; 128K output

Speedn/a

AccessReleased July 24, 2026 · Claude Pro / Max plans · API $5/$25 per 1M tokens (Fast mode $10/$50)

In one line

Anthropic's July flagship: 1M context, thinking on by default, computer use, and the Agentic Index lead, at unchanged Opus pricing. The default choice for long agentic runs where you want one model to hold the whole task.

Coding93

Reasoning94

Writing88

Agents & tools95

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

Alternatives worth a look

Claude Fable 5 (Anthropic) · AA 62.1Claude Pro / Max plans (usage credits since July 7) · API $10/$50 per 1M tokens
Muse Spark 1.3 (Meta) · AA 62.1Released September 2, 2026 · API $1.25/$4.25 per 1M tokens · Contributor tier $0.10/$0.20
GPT-6 Astra (OpenAI) · AA 61.2Released September 4, 2026 · API $10/$50 per 1M tokens ($1 cached) · ChatGPT Plus and Pro · batch tier at $5/$25

Head-to-head: Claude Opus 5 vs Claude Fable 5 · Claude Opus 5 vs GPT-5.6 Sol

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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).