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GPT-5.5 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-5.5 and Yi-Lightning.

OpenAI

GPT-5.5

GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...

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01.AI

Yi-Lightning

Yi-Lightning is 01.AI's (零一万物) 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-5.5Yi-Lightning
ProviderOpenAI01.AI
Context Window1,050,000 tokens131,072 tokens
Agent Suitability95/10082/100
Time to First Token (TTFT)380 ms120 ms
Deployment Modelmanaged apimanaged api
Production Stabilitystablestable
API AvailableYesYes
Released Date2026-04-242025-10-01

API Pricing Comparison

Input Price per Million Tokens

GPT-5.5

$5.00

Yi-Lightning

$0.15

Output Price per Million Tokens

GPT-5.5

$30.00

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.

MMLUGeneral knowledge & multi-task understanding
9420.0%vsN/A
GPT-5.5
Yi-Lightning
HumanEvalPython coding & logic synthesis
9680.0%vsN/A
GPT-5.5
Yi-Lightning
MATHComplex mathematical problem solving
9350.0%vsN/A
GPT-5.5
Yi-Lightning
GPQAGraduate-level expert reasoning
8420.0%vsN/A
GPT-5.5
Yi-Lightning
HellaSwagCommonsense reasoning and inference
9900.0%vsN/A
GPT-5.5
Yi-Lightning
MT-BenchMulti-turn conversation flow quality
970.0%vsN/A
GPT-5.5
Yi-Lightning

GPT-5.5 Quirks & Gotchas

  • ▸Best for JSON schema adherence — strict mode available via response_format parameter
  • ▸Requires explicit tool_choice for deterministic function calling

Yi-Lightning Quirks & Gotchas

  • ▸Best cost-efficiency for high-volume bilingual applications
  • ▸Self-hostable via Ollama — excellent open-weight option for Asian-language pipelines