KIMI K2 vs GPT-5

Comprehensive comparison between Moonshot AI's KIMI K2 and OpenAI's GPT-5. Compare pricing, performance, features, and user reviews.

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KIMI K2

Moonshot AI

Moonshot AI's open-source flagship with top HLE and Live Codebench scores. HN users praise its agentic coding ability approaching Claude Haiku 4.5, making it the coding king among open-source models.

$0.2/$0.6per M tokens
Details

GPT-5

OpenAI

OpenAI's unified flagship model with built-in routing system that auto-selects optimal sub-models. HN users praise its comprehensive multimodal capabilities and competitive pricing ($1.25 vs Claude $15). However, benchmark chart errors at launch sparked controversy.

$1.25/$10per M tokens
Details

Specs Comparison

SpecificationKIMI K2GPT-5
Context Window128K400K
Max Output32K128K
Input (per 1M tokens)$0.20$1.25
Output (per 1M tokens)$0.60$10.00
Reasoning
Open Source

Scenario Score Comparison

Coding
88
vs
86
Writing
70
vs
92
Translation
80
vs
93
Data Analysis
75
vs
91
Conversation
75
vs
94
Image Gen
50
vs
90
Research
—
vs
89
App Building
—
vs
88

KIMI K2

Pros

  • + Open source & free
  • + Strong coding ability
  • + Top HLE score
  • + Good tool calling

Cons

  • − Smaller ecosystem
  • − Slightly weaker English
  • − Incomplete documentation

GPT-5

Pros

  • + Highly competitive pricing
  • + Most comprehensive multimodal
  • + DALL-E integration
  • + Largest ecosystem

Cons

  • − Coding inferior to Claude Opus
  • − Launch quality issues
  • − Black-box architecture

Recommendation

Choose KIMI K2 if you:

  • • Need open source & free
  • • Need strong coding ability
  • • Need top hle score

Choose GPT-5 if you:

  • • Need highly competitive pricing
  • • Need most comprehensive multimodal
  • • Need dall-e integration

Based on scores across 8 scenarios, GPT-5 performs better overall.

KIMI K2 Details GPT-5 Details

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