GPT-5.5
OpenAI · released Apr 22, 2026
Previous flagship of the GPT line, still top-20 on human preference arenas.
54.0
Podium Score
#291 of 673
1482
Arena Elo
17 on Arena
60 t/s
Output Speed
$10/M
Output Price
$2.5/M in
1.1M
Context Window
Scores by Source
Category Scores
👁️ Multimodal100.0
📜 Long Context84.9
🧠 Reasoning80.4
🤖 Agentic61.1
intelligence56.3
💻 Coding54.0
📐 Math25.7
📚 Knowledge20.5
Benchmark Results
τ²-Bench Retail93.9%
GPQA Diamond93.6%
ARC-AGI-285%
Browsecomp84.4%
MMMU-Pro83.2%
Ifbench75.9%
MCP Atlas75.3%
LiveCodeBench74.3%
MRCR v274%
Terminal-Bench Hard60.6%
SWE-Bench Pro58.6%
SciCode56.1%
Toolathlon55.6%
Humanity’s Last Exam52.2%
FrontierMath35.4%
Model Details
| Release date | Apr 22, 2026 |
|---|---|
| Parameters | Not disclosed |
| License | Proprietary |
| Context Window | 1,100,000 tokens |
| Input Price | $2.5/M |
| Output Price | $10/M |
| Output Speed | 60 t/s |
| Time to First Token | — |