o3 Pro alternatives
Match · Updated July 2026
The closest alternative to o3 Pro is Qwen3.5-122B-A10B — comparable intelligence (32.3 vs 32.5); for a cheaper option, Claude Opus 5 runs $5.00/M vs $20.00/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 o3 Pro?
Qwen3.5-122B-A10B is the closest alternative to o3 Pro, with an Intelligence Index of 32.3 (o3 Pro scores 32.5) at $0.260 per million input tokens.
Is there a cheaper alternative to o3 Pro?
Yes — Claude Opus 5 costs $5.00 per million input tokens versus $20.00 for o3 Pro, while staying within ~8 points of its Intelligence Index.
Is there an open-source alternative to o3 Pro?
Kimi K3 is the strongest open-weight alternative to o3 Pro — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.