GPT-6 Luna vs Kimi K3
GPT-6 Luna scores higher on the Models at Work leaderboard (66 vs 60 out of 100). GPT-6 Luna is about 12× cheaper per blended million tokens ($0.20 vs $2.31, one figure an Artificial Analysis estimate). On Artificial Analysis' independent Intelligence Index, Kimi K3 leads 44 to 38.
| GPT-6 Luna · OpenAI | Kimi K3 · Moonshot | |
|---|---|---|
| Leaderboard rank | #10 | #11 |
| Score (0–100) | 66 | 60 |
| Tier | Fast and cheap | Open weights |
| Price per 1M tokens | $0.10 in · $0.50 out | $2.31 blended (estimate) |
| Context window | 1M | Not verified |
| Open weights | No | Yes |
| Artificial Analysis Intelligence Index | 38 | 44 |
| Arena text score | — | 1488 |
| Best for | ChatGPT Free and Go tier, Simple extraction, Cost floors | Self-hosting, Open-licence requirements, Arena-style chat quality |
Choose GPT-6 Luna if…
- you need chatgpt free and go tier
- you need simple extraction
- you need cost floors
OpenAI's ten-cent model: the one every ChatGPT Free user now has, and the one Haiku users keep comparing themselves to.
Choose Kimi K3 if…
- you need self-hosting
- you need open-licence requirements
- you need arena-style chat quality
The highest-placed open-licence model on Arena, and the one most teams have not tried yet.
Caveats: Price is Artificial Analysis' blended figure, not a vendor list price; context not verified from a primary source.
Questions people ask
Which is better, GPT-6 Luna or Kimi K3?
GPT-6 Luna scores higher on the Models at Work leaderboard (66 vs 60 out of 100). GPT-6 Luna is about 12× cheaper per blended million tokens ($0.20 vs $2.31, one figure an Artificial Analysis estimate). On Artificial Analysis' independent Intelligence Index, Kimi K3 leads 44 to 38.
When should I choose GPT-6 Luna over Kimi K3?
Choose GPT-6 Luna for chatgpt free and go tier, simple extraction, cost floors. OpenAI's ten-cent model: the one every ChatGPT Free user now has, and the one Haiku users keep comparing themselves to.
When should I choose Kimi K3 over GPT-6 Luna?
Choose Kimi K3 for self-hosting, open-licence requirements, arena-style chat quality. The highest-placed open-licence model on Arena, and the one most teams have not tried yet.
Which is cheaper, GPT-6 Luna or Kimi K3?
GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens on OpenAI's list price (OpenAI API pricing, read Oct 10, 2026). Moonshot does not publish a simple list price for Kimi K3; Artificial Analysis estimates a blended $2.31 per million tokens (three input to one output).
Scores come from the Models at Work leaderboard: Score is 0 to 100: 50% independent evals normalised within this table, 20% price-performance, 15% practitioner sentiment from Signals and community threads, 15% operational fit (context, speed, availability, open weights). Models within three points are a tie in practice. Vendor-published figures are labelled as such and never counted as independent. Prices are vendor list prices where published; blended figures assume three input tokens per output token.