Automated page. Written and translated automatically by AI and checked against the sources by software; no human editor. SI-IQ is an index built from public benchmark results, not an IQ test. How it works

How smart is GPT-5.6 Sol?

140 SI-IQ · 90% interval 137–143
Rank 7 of 80 ranked models · Plausible rank range 3–12

GPT-5.6 Sol is a model from OpenAI, released on Jul 9, 2026. Its SI-IQ is 140 (90% interval 137–143), estimated from 8 benchmark results by 2 independent evaluators. Its strongest area is Math and its weakest is Knowledge.

Facts

Developer: OpenAI
Released: Jul 9, 2026
Access: API access
Benchmarks used: 8 results from 2 evaluators
API price: $4.00 input / $20 output per 1M tokens (developer's price list, Oct 18, 2026)
Context window: 922,000 tokens

Ability by area (SI-IQ, 90% interval)

Every benchmark result we used

Each score is one value exactly as the source published it: for Epoch AI the best of its run settings, for OpenRouter the median hosting provider (the developer's own hosting when it ran the test). “Implied SI-IQ” is the ability that this single result points to; the overall SI-IQ is their precision-weighted average.

Benchmark	Area	Score	Implied SI-IQ	Evaluated by	As listed by the source	Retrieved	Source
Chess Puzzles	Reasoning	59.0%	139	Epoch AI	`gpt-5.6-sol_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
Furniture Assembly not in index	Reasoning	56.7%	—	Epoch AI	`gpt-5.6-sol_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
Mystery Game Puzzles	Reasoning	58.0%	141	Epoch AI	`gpt-5.6-sol_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tier 4	Math	82.9%	141	Epoch AI	`gpt-5.6-sol_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tiers 1–3	Math	89.1%	141	Epoch AI	`gpt-5.6-sol_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
OTIS Mock AIME 2024–2025	Math	100.0%	142	Epoch AI	`gpt-5.6-sol_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond	Knowledge	93.5%	134	Epoch AI	`gpt-5.6-sol_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond (OpenRouter run)	Knowledge	92.3%	136	OpenRouter	`openai/gpt-5.6-sol-20260709` OpenAI · first-party provider (1 of 3 rows)	Oct 18, 2026	OpenRouter benchmark datasets · data file
SimpleQA Verified	Knowledge	69.7%	149	Epoch AI	`gpt-5.6-sol_max`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
τ²-bench Airline (OpenRouter run)	Agents	73.3%	126	OpenRouter	`openai/gpt-5.6-sol-20260709` OpenAI · first-party provider (1 of 3 rows)	Oct 18, 2026	OpenRouter benchmark datasets · data file

Models with similar SI-IQ

Model	SI-IQ
Gemini 4 ArgonGoogle DeepMind	140	GPT-5.6 Sol vs Gemini 4 Argon
Claude Fable 5.1Anthropic	140	GPT-5.6 Sol vs Claude Fable 5.1
GPT-6 SolOpenAI	140	GPT-5.6 Sol vs GPT-6 Sol
Claude Sonnet 5.5Anthropic	140	GPT-5.6 Sol vs Claude Sonnet 5.5
GPT-5.5OpenAI	138	GPT-5.6 Sol vs GPT-5.5

Computed with SI-IQ method version 1.0.0. Read the full methodology

Data sources: Epoch AI, ‘Capabilities & benchmarking’ (CC BY 4.0); API list prices via LiteLLM's price table (MIT); each price links to the developer's pricing page; Source: OpenRouter (openrouter.ai), licensed under CC BY 4.0.