Sonar Pro Search alternatives
Match · Updated July 2026
The closest alternative to Sonar Pro Search is Sonar Reasoning Pro — comparable intelligence (17.8 vs —); for a cheaper option, GPT-5.6 Terra runs $1.25/M vs $3.00/M; and the best open-weight substitute is Kimi K3.
Closest match
Cheaper alternatives
gpt-5.6-terra
$1.25/M input · 55.0 intel
grok-4.5
$2.00/M input · 53.8 intel
claude-sonnet-5
$2.00/M input · 53.4 intel
gpt-5.4
$2.50/M input · 51.4 intel
gpt-5.6-luna
$0.500/M input · 51.2 intel
glm-5.2
$0.769/M input · 51.1 intel
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
deepseek-v4-pro
44.3 intel · open weights · 1.0M ctx
kimi-k2.6
44.2 intel · open weights · 262K ctx
mimo-v2.5-pro
42.2 intel · open weights · 1.1M ctx
Frequently asked
What is the best alternative to Sonar Pro Search?
Sonar Reasoning Pro is the closest alternative to Sonar Pro Search, with an Intelligence Index of 17.8 (Sonar Pro Search scores —) at $2.00 per million input tokens.
Is there a cheaper alternative to Sonar Pro Search?
Yes — GPT-5.6 Terra costs $1.25 per million input tokens versus $3.00 for Sonar Pro Search, while staying within ~8 points of its Intelligence Index.
Is there an open-source alternative to Sonar Pro Search?
Kimi K3 is the strongest open-weight alternative to Sonar Pro Search — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.