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GPT-5.5
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Tool use · Reasoning
Overview
Pricing
Evaluations
Evaluation overview
Overall rank
#11
90.9 points · 201 models
Research rank
#8
97.2 points · 195 models
Data coverage
192 items
20 sources · updated through 2026-09-02
Domain performance
Coding
#22 / 181
86.5
Research
#8 / 195
97.2
Agents
#10 / 147
88.7
Vision
#15 / 81
85.1
Long context
#9 / 95
88.8
Evaluation highlights
All evaluations
Arena Agent Tool Hallucination
Agents · Arena.ai Agent
1.33%
1
/ 52
Arena Text Rating
Reasoning · Arena.ai Text · High mode
1,482.36Elo
17
/ 375
SWE-bench Verified
Coding · Hy3 Hugging Face README
84.4%
3
/ 63
IFEval
Instruction following · LongCat-2.0 Technical Report
95%
2
/ 30
Arena Vision Rating
Multimodal · Arena.ai Vision · High mode
1,286.43Elo
10
/ 133
CL-bench life
Long context · Hy3 Hugging Face README
21.1%
1
/ 11
Basic information
Context (input / output)
1.05M / 128K
Release date
2026-04
Input modalities
Text · Image
Output modalities
Text
Reliable knowledge cutoff
2025-12
Availability
OpenAI
Full pricing
Input
$5 /1M
Output
$30 /1M
Related links
Official site
Version relationships
GPT-5.5 family
GPT-5.5
Current
2026-04 · Current model
GPT-5.5 Pro
2026-04 · Same series
GPT-5.5 Instant
2026-05 · Same series
Provider variants
Search · xHigh / Codex Harness
Runtime modes
High · xHigh