GPT-5.1 review, price and benchmarks (2026)

legacy paid api

Provider

Statuslegacy

AA Intelligence Index36.9 (July 16, 2026 snapshot)

Releasedn/a

Context windown/a

Modalitiesn/a

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

Speedn/a

AccessAPI (legacy)

In one line

Late-2025 generation, kept for compatibility - two clear steps behind the current line.

Coding62

Reasoning60

Writing62

Agents & tools55

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

Alternatives worth a look

Qwen3.6-27B (Alibaba) · AA 37Open weights (Apache 2.0) · runs on a good desktop
Gemini 3.5 Flash-Lite (Google) · AA 36.5API $0.30/$2.50 per 1M tokens
Grok 4.3 (xAI) · AA 37.6grok.com paid tiers · API

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Artificial Analysis Intelligence Index, 2026 rebased scale (top models ≈ 55–60). Snapshot: July 24, 2026 (BenchLM mirror), retrieved July 26, 2026. Context, price and release data come from vendor pages and public pricing mirrors (retrieved July 19, 2026). Missing values are not published or not yet verified - shown as -. Sources are linked inside the app (Model guide and About > Methodology).