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How smart is GPT-5.4 Nano?

118 SI-IQ · 90% interval 115–121
Rank 44 of 80 ranked models · Plausible rank range 33–58

GPT-5.4 Nano is a model from OpenAI, released on Mar 17, 2026. Its SI-IQ is 118 (90% interval 115–121), estimated from 8 benchmark results by 2 independent evaluators. Its strongest area is Reasoning and its weakest is Knowledge.

Facts

Developer: OpenAI
Released: Mar 17, 2026
Access: API access
Benchmarks used: 8 results from 2 evaluators
API price: $0.20 input / $1.25 output per 1M tokens (developer's price list, Oct 18, 2026)
Context window: 272,000 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	45.0%	131	Epoch AI	`gpt-5.4-nano-2026-03-17_xhigh`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
Mystery Game Puzzles	Reasoning	9.0%	70	Epoch AI	`gpt-5.4-nano-2026-03-17_none`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tier 4	Math	12.2%	118	Epoch AI	`gpt-5.4-nano-2026-03-17_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
FrontierMath Tiers 1–3	Math	44.9%	118	Epoch AI	`gpt-5.4-nano-2026-03-17_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
OTIS Mock AIME 2024–2025	Math	87.8%	114	Epoch AI	`gpt-5.4-nano-2026-03-17_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond	Knowledge	78.5%	105	Epoch AI	`gpt-5.4-nano-2026-03-17_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
GPQA Diamond (OpenRouter run)	Knowledge	77.6%	107	OpenRouter	`openai/gpt-5.4-nano-20260317` OpenAI · first-party provider (1 of 2 rows)	Oct 18, 2026	OpenRouter benchmark datasets · data file
SimpleQA Verified	Knowledge	11.7%	81	Epoch AI	`gpt-5.4-nano-2026-03-17_high`	Oct 18, 2026	Epoch AI Benchmarking Hub · data file
τ²-bench Airline (OpenRouter run)	Agents	65.2%	112	OpenRouter	`openai/gpt-5.4-nano-20260317` OpenAI · first-party provider (1 of 2 rows)	Oct 18, 2026	OpenRouter benchmark datasets · data file

Models with similar SI-IQ

Model	SI-IQ
Inkling-SmallThinking Machines	118	GPT-5.4 Nano vs Inkling-Small
Kimi K2.7 CodeMoonshot	118	GPT-5.4 Nano vs Kimi K2.7 Code
Kimi K2.5Moonshot	119	GPT-5.4 Nano vs Kimi K2.5
GPT-5.4 MiniOpenAI	117	GPT-5.4 Nano vs GPT-5.4 Mini
DeepSeek-V4-ProDeepSeek	117	GPT-5.4 Nano vs DeepSeek-V4-Pro

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: reuse and republish with attribution to OpenRouter..