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GPT-5.5 Pro

Highest-accuracy GPT-5.5 tier for slower, precision-heavy reasoning and coding

Source-linked gpt-pro Closed weights Released 2026-04-23
API data Report
Input modalitiesT
Output modalitiesT
Input price$30/1M tokens
Output price$180/1M tokens
Context window1.05M
Max output128K
Overview

Capabilities and specifications

✓ Reasoning Yes
✓ Tool calling Yes
✓ Structured output Yes
✓ Attachments Yes
✓ Vision input Yes
× Open weights No
Creator
OpenAI
Model family
gpt-pro
Knowledge cutoff
2025-12-01
License
Not documented
Release date
2026-04-23
Model ID
openai/gpt-5.5-pro
Inference availability

Provider pricing and availability

Provider-specific identifiers, limits, and prices per million tokens.

Report a price
Providers offering GPT-5.5 Pro
ProviderProvider model IDContextInputOutputCache readCapabilitiesSource
Poe openai/gpt-5.5-pro 400K $27.273 $163.636 - ReasoningTools Docs
Vercel AI Gateway openai/gpt-5.5-pro 1M $30 $180 - ReasoningToolsJSON Docs
CrossModel openai/gpt-5.5-pro 1.05M $30 $180 - ReasoningToolsJSON Docs
ZenMux openai/gpt-5.5-pro 1.05M $30 $180 - ReasoningToolsJSON Docs
OpenAI gpt-5.5-pro 1.05M $30 $180 - ReasoningToolsJSON Docs
OrcaRouter openai/gpt-5.5-pro 1.05M $30 $180 - ReasoningToolsJSON Docs
LLM Gateway gpt-5.5-pro 1.05M $30 $180 - ReasoningToolsJSON Docs
OpenCode Zen gpt-5.5-pro 1.05M $30 $180 $30 ReasoningTools Docs
Kilo Gateway openai/gpt-5.5-pro 1.05M $30 $180 - ReasoningTools Docs
OpenRouter openai/gpt-5.5-pro 1.05M $30 $180 - ReasoningToolsJSON Docs
FastRouter openai/gpt-5.5-pro 1.05M $30 $180 - ReasoningToolsJSON Docs

Capability badges appear only when the provider catalog explicitly lists support.

Serving quality

Performance and reliability

Observed serving measurements stay separate from model specifications and are never estimated from price or model size.

Throughput Not reported

Generation speed; higher is faster.

Latency / TTFT Not reported

Time until the first output token arrives.

Uptime Not reported

Successful requests over a measured period.

Performance varies by inference provider, region, and load. Provider-level measurements appear only when a source reports them.

Published evaluations

Benchmarks

Raw results remain attached to their original source and version.

Benchmark registry
BrowseComp - Unversioned - accuracyTop 7 reported models
GPT-5.6 Sol
90.4
GPT-5.5 Pro
90.1
GPT-5.4 Pro
89.3
GPT-5.6 Terra
87.5
Claude Sonnet 5
84.7
GPT-5.5
84.4
MiniMax-M3
83.5
FrontierMath - Unversioned - accuracyTop 4 reported models
GPT-5.5 Pro
39.6
GPT-5.4 Pro
38.0
GPT-5.5
35.4
GPT-5.4
27.1
GDPval - Unversioned - wins or tiesTop 6 reported models
GPT-5.5
84.9
GPT-5.4
83.0
GPT-5.5 Pro
82.3
GPT-5.4 Pro
82.0
Nemotron 3 Ultra 550B A55B
46.7
Step 3.7 Flash
45.8
GeneBench - Unversioned - accuracyTop 2 reported models
GPT-5.5 Pro
33.2
GPT-5.4 Pro
25.6
Humanity's Last Exam - Unversioned - accuracyTop 7 reported models
Claude Fable 5
64.5
Muse Spark 1.1
62.1
GPT-5.4 Pro
58.7
Claude Opus 4.8
57.9
GPT-5.5 Pro
57.2
Claude Opus 4.7
54.7
GPT-5.5
52.2
Catalog activity

Recent record changes

Detected changes from successful source imports.

Full change log
No recent changes detected

This record has not changed in the retained import history.

Public API

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Fetch the complete source-linked model record without an API key.

API documentation
Endpoint
GET https://www.modelbench.lol/api/v1/models/openai/gpt-5.5-pro
curl
curl "https://www.modelbench.lol/api/v1/models/openai/gpt-5.5-pro"