GPT-3.5 Turbo (older v0613) alternatives
Match · Updated July 2026
The closest alternative to GPT-3.5 Turbo (older v0613) is GPT-5.6 Luna Pro — comparable intelligence (— vs —); for a cheaper option, GPT-5.6 Luna runs $0.500/M vs $1.00/M; and the best open-weight substitute is Kimi K3.
Closest match
Cheaper alternatives
gpt-5.6-luna
$0.500/M input · 51.2 intel
glm-5.2
$0.697/M input · 51.1 intel
gemini-3.5-flash:batch
$0.750/M input · 50.2 intel
gemini-3.6-flash:batch
$0.750/M input · 50.1 intel
minimax-m3
$0.300/M input · 44.4 intel
minimax-m3:batch
$0.150/M input · 44.4 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
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 GPT-3.5 Turbo (older v0613)?
GPT-5.6 Luna Pro is the closest alternative to GPT-3.5 Turbo (older v0613), with an Intelligence Index of — (GPT-3.5 Turbo (older v0613) scores —) at $0.500 per million input tokens.
Is there a cheaper alternative to GPT-3.5 Turbo (older v0613)?
Yes — GPT-5.6 Luna costs $0.500 per million input tokens versus $1.00 for GPT-3.5 Turbo (older v0613), while staying within ~8 points of its Intelligence Index.
Is there an open-source alternative to GPT-3.5 Turbo (older v0613)?
Kimi K3 is the strongest open-weight alternative to GPT-3.5 Turbo (older v0613) — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.