o1 alternatives
Match · Updated July 2026
The closest alternative to o1 is Kimi K2 0905 — comparable intelligence (23.5 vs 23.4); for a cheaper option, Claude Opus 5 runs $5.00/M vs $15.00/M; and the best open-weight substitute is Kimi K3.
Closest match
Cheaper alternatives
claude-opus-5
$5.00/M input · 60.7 intel
claude-fable-5
$10.00/M input · 59.9 intel
claude-fable-5:batch
$5.00/M input · 59.9 intel
gpt-5.6-sol
$5.00/M input · 58.9 intel
kimi-k3
$3.00/M input · 57.1 intel
claude-opus-4.8
$5.00/M input · 55.7 intel
Smarter alternatives
Open-source alternatives
kimi-k3
57.1 intel · open weights · 1.0M ctx
glm-5.2
51.1 intel · open weights · 1.0M ctx
minimax-m3
44.4 intel · open weights · 1.0M ctx
minimax-m3:batch
44.4 intel · open weights · 524K ctx
deepseek-v4-pro
44.3 intel · open weights · 1.0M ctx
kimi-k2.6
44.2 intel · open weights · 262K ctx
Frequently asked
What is the best alternative to o1?
Kimi K2 0905 is the closest alternative to o1, with an Intelligence Index of 23.5 (o1 scores 23.4) at $0.600 per million input tokens.
Is there a cheaper alternative to o1?
Yes — Claude Opus 5 costs $5.00 per million input tokens versus $15.00 for o1, while staying within ~8 points of its Intelligence Index.
Is there an open-source alternative to o1?
Kimi K3 is the strongest open-weight alternative to o1 — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.