WhichAI / Models / GPT-5.5 Pro

GPT-5.5 Pro

· verified July 26, 2026

public paid api in Generator reasoning

Provider

Statuspublic

AA Intelligence Index~58 (WhichAI estimate)

Releasedn/a

Context windown/a

Modalitiesn/a

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

Speedn/a

AccessChatGPT Pro ($200/mo) · API

The score shown is a WhichAI estimate from adjacent benchmarks, not an official measurement.

In one line

Maximum-reasoning tier of GPT-5.5 - statistically tied with the very top on many boards. Overkill for everyday tasks.

Coding90

Reasoning91

Writing82

Agents & tools87

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

Alternatives worth a look

GPT-5.6 Sol (OpenAI) · AA 58.9Released July 9, 2026 (rolling out) · API $5/$30 per 1M tokens · up to 750 tok/s on Cerebras
Kimi K3 (Moonshot AI) · AA 57.1API $3/$15 per 1M tokens ($0.30 cached) · kimi.com chat · open weights announced for July 27 (Modified MIT)
Claude Fable 5 (Anthropic) · AA 59.9Claude Pro / Max plans (usage credits since July 7) · API $10/$50 per 1M tokens

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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).