OpenAI
o1
CTX200K
Retired
61Quality
Reasoning · Vision · Tools
TextImagePDFInput$15/M
TextOutput$60/M
O-series reasoning model for hard analysis, math, coding, and planning
PaidProprietary449/1044
OpenAI · Text line
2 stages over 4 months, from o1 in Dec 2024 to o3 in Apr 2025.
O-series reasoning model for hard analysis, math, coding, and planning
Every generation. A new possibility.
o1 · Dec 20242 stages, from o1 (Dec 2024) to o3 (Apr 2025). Press Evolve to watch each step.
Context window
Max output
Output priceper 1M tokens, lower is better
v1 Stage 1
O-series reasoning model for hard analysis, math, coding, and planning
v3 Stage 2
Deliberate o-series reasoner for hard math, coding, and multi-step analysis