Grok 4 review, price and benchmarks (2026)

legacy paid api

Provider

Statuslegacy

AA Intelligence Index33.3 (September 8, 2026 snapshot)

Releasedn/a

Context windown/a

Modalitiesn/a

API price $/1M (in / out)n/a

Speedn/a

AccessAPI (legacy)

In one line

Previous xAI generation - superseded by 4.1's larger context and then by the 4.3/4.5 wave.

Coding58

Reasoning62

Writing52

Agents & tools56

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

Alternatives worth a look

Qwen3.5 397B (Alibaba) · AA 33.7Open weights (Apache 2.0)
Kimi K2.5 (Moonshot AI) · AA 35.4Open weights · API hosts
Claude Sonnet 4.6 (Anthropic) · AA 35.9Claude Pro · API

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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).