GPT-5.4 Mini
GPT-5.4 Mini is an API-only (closed weights) language model from OpenAI, released March 17, 2026. The context window is 391K tokens. On the Epoch Capabilities Index it scores 149.3, rank 73 of 256 rated models. API price: $0.75 input / $4.5 output per million tokens.
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Lab
OpenAI
Released
March 17, 2026
Weights
API-only (closed weights)
Parameters
–
Context
391K
Price / M tokens
$0.75 / $4.5 in / out
Epoch ECI
149.3 #73
Strengths by category
ModelTape's 0–100 fit on Epoch AI benchmark results.
| Category | Score | Based on |
|---|---|---|
| Reasoning | 13.4 | Chess Puzzles, Mystery Game Puzzles |
| Math | 38.6 | ProofBench, OTIS Mock AIME 2024-2025, FrontierMath-Tiers-1-3-v2-Private, FrontierMath-Tier-4-v2-Private |
| Knowledge | 67.9 | GPQA diamond, SimpleQA Verified |
Benchmark results
| Benchmark (Epoch AI) | Score |
|---|---|
| OTIS Mock AIME | 88.9% |
| GPQA Diamond | 85.9% |
| FrontierMath (Tiers 1–3) | 53.9% |
| SimpleQA Verified | 29.4% |
| ProofBench | 21.0% |
| Chess Puzzles | 19.0% |
| FrontierMath-Tier-4-v2-Private | 9.8% |
| Mystery Game Puzzles | 2.0% |
Links
Announcement · Epoch AI benchmarks
Models with a similar score
Muse Spark · GLM-5.2 · Gemini 3 Pro · Claude Sonnet 4.6 · Mistral Large 4 Preview · Qwen 3.8 27B · Gemini 3 Flash · Grok 4.20
More from OpenAI
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