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GPT-4.1 vs Yi-Lightning

How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for GPT-4.1 and Yi-Lightning.

OpenAI

GPT-4.1

GPT-4.1 is a flagship large language model optimized for advanced instruction following, real-world software engineering, and long-context reasoning. It supports a 1 million token context window and outperforms GPT-4o and...

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01.AI

Yi-Lightning

Yi-Lightning is 01.AI's (離一万物) fastest and most cost-efficient model, purpose-built for high-throughput production workloads. It delivers competitive performance against GPT-4o-mini and Claude Haiku at a fraction of the cost, with exceptional bilingual Chinese-English capabilities. Yi-Lightning excels at classification, entity extraction, summarization, and high-frequency API tasks where latency and cost-per-call are critical constraints.

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Technical Specifications

SpecificationGPT-4.1Yi-Lightning
ProviderOpenAI01.AI
Context Window1,047,576 tokens131,072 tokens
Agent Suitability91/10082/100
Time to First Token (TTFT)250 ms120 ms
Deployment Modelmanaged apimanaged api
Production Stabilitystablestable
API AvailableYesYes
Released Date2025-04-142025-10-01

API Pricing Comparison

Input Price per Million Tokens

GPT-4.1

$2.00

Yi-Lightning

$0.15

Output Price per Million Tokens

GPT-4.1

$8.00

Yi-Lightning

$0.30

Want to test both models live?

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Benchmark Performance Metrics

Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.

GPT-4.1 Quirks & Gotchas

  • β–ΈStrong tool-calling reliability β€” good migration path from GPT-4o
  • β–ΈMigrate to GPT-5 for larger context window and improved reasoning

Yi-Lightning Quirks & Gotchas

  • β–ΈBest cost-efficiency for high-volume bilingual applications
  • β–ΈSelf-hostable via Ollama β€” excellent open-weight option for Asian-language pipelines