WhichAI / Models / GPT-5.6 Sol

GPT-5.6 Sol

· verified July 26, 2026

public paid api in Generator reasoning agents coding

Provider

Statuspublic

AA Intelligence Index58.9 (July 16, 2026 snapshot)

Released2026-07-09

Context window1M

Modalitiesn/a

API price $/1M (in / out)$5 / $30

Speedup to 750 tok/s (Cerebras)

AccessReleased July 9, 2026 (rolling out) · API $5/$30 per 1M tokens · up to 750 tok/s on Cerebras

In one line

OpenAI's new flagship and #1 on the public AA index snapshot: max reasoning effort, programmatic tool calling, and an 'ultra mode' that spins up subagents. The model to beat for hard reasoning and agentic work.

Coding91

Reasoning93

Writing82

Agents & tools93

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 59.9Claude Pro / Max plans (usage credits since July 7) · API $10/$50 per 1M tokens
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 Opus 5 (Anthropic) · AA 60.7Released July 24, 2026 · Claude Pro / Max plans · API $5/$25 per 1M tokens (Fast mode $10/$50)

Head-to-head: GPT-5.6 Sol vs Claude Opus 5 · GPT-5.6 Sol vs Claude Fable 5 · GPT-5.6 Sol vs Kimi K3

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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).