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OpenAI · API-only (closed weights)

o1-pro

o1-pro is an API-only (closed weights) language model from OpenAI, released March 19, 2025. The context window is 195K tokens. API price: $150 input / $600 output per million tokens.

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Lab
OpenAI
Released
March 19, 2025
Weights
API-only (closed weights)
Parameters
–
Context
195K
Price / M tokens
$150 / $600 in / out
Epoch ECI
not yet rated

Benchmark results

Benchmark (Epoch AI)Score
Humanity's Last Exam8.1%

Links

Epoch AI benchmarks

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Data updated Thu, 12 Nov 2026 09:42 UTC. Benchmarks, Capabilities Index and model announcements: Epoch AI, “Capabilities & benchmarking” and “Data on AI models” (CC BY 4.0); category scores are ModelTape's own fit on Epoch's results. Releases and prices: models.dev (MIT). Sizes and quantizations: Hugging Face. “Runs on” figures are estimates from model size, quantization and memory bandwidth (±30–50%).
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