WhichAI / Models / Claude Opus 4.8

Claude Opus 4.8

· verified September 8, 2026

public paid api in Generator coding agents reasoning

Provider

Statuspublic

AA Intelligence Index57.3 (September 8, 2026 snapshot)

Releasedn/a

Context window1M

Modalitiesn/a

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

Speedn/a

AccessClaude Pro $20/mo · API

In one line

The leader on real-repo coding when it shipped (SWE-bench Pro 69.2%) and still a serious software workhorse, now at a price its successors undercut. Worth choosing deliberately rather than by default.

Coding92

Reasoning88

Writing84

Agents & tools91

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

Alternatives worth a look

GLM-5.3-Flash (Z.ai) · AA 57.5Released August 26, 2026 · open weights under MIT · API $0.15/$0.50 per 1M tokens · free chat at chat.z.ai
Muse Spark 1.2 (Meta) · AA 56.8API via Meta Superintelligence Labs (August 6, 2026 refresh of the 1.1 line)
GPT-5.6 Terra (OpenAI) · AA 56.6Released July 9, 2026 · API $2.50/$15 per 1M tokens

Head-to-head: Claude Opus 4.8 vs Claude Fable 5 · Claude Opus 4.8 vs GPT-5.5 · Claude Opus 4.8 vs Kimi K3

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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).