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LegacyVerified ·
The original GPT-5 launch model, now legacy; the foundation of the GPT-5 family with reasoning and long-context support.
profile normalized against the 47-model field
Context window· 400K of 1.05M38%
Max output· 100K of 272K37%
Output speed· 78 tok/s24%
Affordability· $10.00 / Mtok out95%
Capability breadth· 7 of 1164%
Capability switches · 7 of 11
Reasoning mode
Tool / function use
Streaming
JSON mode
Structured outputs
Prompt caching
Fine-tuning
Web search
Code execution
Vision input
Audio input
Specifications
Every value carries a primary source and a verification date.
Pricing
Input $/Mtok$1.25 / Mtok USD/Mtok
Cached input $/Mtok$0.125 / Mtok USD/Mtok
Output $/Mtok$10.00 / Mtok USD/Mtok
Performance
Output speed78 tok/s tok/s
Time to first token640 ms ms
Capabilities
Input modalitiesText, image
Tool / function usetrue
Structured outputstrue
General
Knowledge cutoffSeptember 30, 2024
Benchmarks
Sourced evaluation scores, each verified against its primary source.
GPQA Diamond
GPQA Diamond: 70.2%
SWE-bench Verified
SWE-bench Verified: 56.8%
AIME 2025
AIME 2025: 78.5%