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GPT-5.1-Codex-Mini alternatives

Quick answer · Updated June 2026

The closest alternative to GPT-5.1-Codex-Mini is Ring-2.6-1T — comparable intelligence (38.5 vs 38.6); for a cheaper option, MiMo-V2.5 runs $0.140/M vs $0.250/M; for more speed, gpt-oss-120b (free) hits 554 t/s; and the best open-weight substitute is MiniMax M3.

Closest match

I
ring-2.6-1t
Intelligence 38.5 · $0.075/M · 77 t/s
ReasoningTools+1

Cheaper alternatives

X
mimo-v2.5
$0.140/M input · 49.0 intel
ReasoningTools+3N
nemotron-3-ultra-550b-a55b:free
Free/M input · 47.7 intel
ReasoningToolsD
deepseek-v4-flash
$0.098/M input · 46.0 intel
ReasoningTools+1O
gpt-5.4-nano
$0.200/M input · 44.0 intel
ReasoningTools+2S
step-3.7-flash
$0.200/M input · 42.6 intel
ReasoningTools+2T
hy3-preview
$0.063/M input · 41.9 intel
ReasoningTools

Faster alternatives

O
gpt-oss-120b:free
554 t/s · 161ms ttft
ReasoningToolsO
gpt-oss-120b
554 t/s · 161ms ttft
ReasoningTools+1I
mercury-2
476 t/s · 253ms ttft
ReasoningTools+1M
minimax-m2.7
273 t/s · 465ms ttft
ReasoningTools+1M
minimax-m2.5
183 t/s · 532ms ttft
ReasoningTools+1Z
glm-4.7
179 t/s · 328ms ttft
ReasoningTools+1

Smarter alternatives

O
gpt-5-mini
38.9 intel · $0.250/M
ReasoningTools+2M
mistral-medium-3-5
39.2 intel · $1.50/M
ReasoningTools+2G
gemma-4-31b-it:free
39.2 intel · Free/M
ReasoningTools+2G
gemma-4-31b-it
39.2 intel · $0.120/M
ReasoningTools+2D
deepseek-v4-pro
39.3 intel · $0.435/M
ReasoningTools+1M
minimax-m2.1
39.4 intel · $0.290/M
ReasoningTools+1

Open-source alternatives

M
minimax-m3
54.7 intel · open weights · 1.0M ctx
ReasoningTools+2X
mimo-v2.5-pro
53.8 intel · open weights · 1.0M ctx
ReasoningTools+1M
minimax-m2.7
49.6 intel · open weights · 205K ctx
ReasoningTools+1X
mimo-v2.5
49.0 intel · open weights · 1.0M ctx
ReasoningTools+3N
nemotron-3-ultra-550b-a55b:free
47.7 intel · open weights · 1M ctx
ReasoningToolsN
nemotron-3-ultra-550b-a55b
47.7 intel · open weights · 1M ctx
ReasoningTools+1

Frequently asked

What is the best alternative to GPT-5.1-Codex-Mini?

Ring-2.6-1T is the closest alternative to GPT-5.1-Codex-Mini, with an Intelligence Index of 38.5 (GPT-5.1-Codex-Mini scores 38.6) at $0.075 per million input tokens.

Is there a cheaper alternative to GPT-5.1-Codex-Mini?

Yes — MiMo-V2.5 costs $0.140 per million input tokens versus $0.250 for GPT-5.1-Codex-Mini, while staying within ~8 points of its Intelligence Index.

Is there an open-source alternative to GPT-5.1-Codex-Mini?

MiniMax M3 is the strongest open-weight alternative to GPT-5.1-Codex-Mini — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.

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