Claude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/MClaude Fable 5$22.000/MClaude Opus 4.8$11.000/MClaude Opus 4.7$11.000/MClaude Opus 4.6$11.000/MClaude Opus 4.5$33.000/MClaude Sonnet 3.7$6.600/MClaude Opus 3$33.000/MClaude 2.1$12.800/MClaude 2$12.800/MGPT-5.5$12.500/MGPT-5.2$5.425/MGPT-5.2-Codex$5.425/MGPT-5$3.875/MGPT-4.5$97.500/MGPT-4 Turbo Preview$16.000/MGPT-4$39.000/MGPT-4-32k$78.000/Mo3$19.000/Mo3-mini$2.090/Mo4-mini$2.090/Mo1$28.500/Mo1-mini$5.700/Mo1-preview$28.500/MGemini 3.5 Pro$5.000/MGemini 3.1 Pro$5.000/MGemini 3 Pro$5.000/MGemini 2.5 Pro$3.875/MGemini 1.5 Pro$2.375/MGemini 1.0 Ultra$12.000/MGemini 1.0 Pro$0.800/M
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01.AIEfficient

Yi-Lightning

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01.AI's flagship hosted Yi. Strong bilingual (English/Chinese) chat at competitive pricing — well-regarded on LMArena.

Yi-Lightning is a efficient AI model from 01.AI. It costs $0.140 per million input tokens and $0.140 per million output tokens (blended $0.140/M), with a 16K-token context window.

Released Oct 2024Modalities textOfficial model page ↗Compare with another model →Estimate monthly cost →
INPUT
$0.140/M
per million input tokens
OUTPUT
$0.140/M
per million output tokens
BLENDED 70/30
$0.140/M
default reference rate · how it's calculated →
CONTEXT
16K
16,000 tokens
What it's good at
  • Bilingual EN/ZH
  • Competitive LMArena ranking
  • Cheap relative to closed frontier
Typical use cases
  • Bilingual production chat
  • Cost-sensitive frontier-ish traffic
Benchmarks
vs. best public score
MMLU80%
Multitask academic knowledge across 57 subjects.
MATH65%
High-school competition math problems.
HumanEval75%
Python function synthesis from docstrings.
LMArena Elo1244 Elo
Crowd-sourced head-to-head preference Elo rating.
Hand-curated from each provider's published reports and public leaderboards. Methodology varies across sources — treat as directional rather than authoritative.
More from 01.AI
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in $3.000/Mout $3.000/M
Yi-Large-Turbo
Balanced · 16K ctx
in $0.380/Mout $0.380/M
Yi-34B-Chat
Open Large · 4K ctx
in $0.800/Mout $0.800/M
Yi-34B
Open Base · 4K ctx
in $0.800/Mout $0.800/M
Yi-9B
Compact · 4K ctx
in $0.300/Mout $0.300/M
Yi-6B
Nano · 4K ctx
in $0.150/Mout $0.150/M
Frequently asked questions

How much does Yi-Lightning cost?

Yi-Lightning costs $0.140 per million input tokens and $0.140 per million output tokens, for a blended reference rate of $0.140 per million tokens.

What is Yi-Lightning's context window?

Yi-Lightning supports up to 16K tokens of context (16,000 tokens).

What is Yi-Lightning best for?

Yi-Lightning is well suited to Bilingual EN/ZH, Competitive LMArena ranking and Cheap relative to closed frontier.

Who makes Yi-Lightning?

Yi-Lightning is developed and served by 01.AI. It was released in Oct 2024.