Model Comparison
GPT-5.4 vs Kimi K3Which is better in 2026?
Kimi K3 significantly outperforms across most benchmarks. GPT-5.4 is 1.1x cheaper per token.
Verdict: GPT-5.4 vs Kimi K3 — which is better?
GPT-5.4 (by OpenAI) and Kimi K3 (by Moonshot AI) are two of the AI models people compare most. Here is how they stack up on benchmarks, price and capabilities, and which one to pick in 2026.
GPT-5.4 outperforms in 0 benchmarks, while Kimi K3 is better at 8 benchmarks (BrowseComp, FrontierSWE, GDPval-AA, GPQA, Humanity's Last Exam, MCP Atlas, MMMU-Pro, Toolathlon). Kimi K3 significantly outperforms across most benchmarks.
On price, GPT-5.4 is roughly 1.1x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Kimi K3 also accepts a larger context window (1,048,576 input tokens), making it the stronger choice for long documents and large codebases.
Choose GPT-5.4 if…
- cost matters — it's about 1.1x cheaper per token
Choose Kimi K3 if…
- you want the strongest raw capability — it leads on 8 of 8 shared benchmarks
- you process long inputs — it offers a 1,048,576 token context window
- you want the most recent training data — it shipped Jul 2026
Performance Benchmarks
Comparative analysis across standard metrics
GPT-5.4 outperforms in 0 benchmarks, while Kimi K3 is better at 8 benchmarks (BrowseComp, FrontierSWE, GDPval-AA, GPQA, Humanity's Last Exam, MCP Atlas, MMMU-Pro, Toolathlon).
Kimi K3 significantly outperforms across most benchmarks.
Arena Performance
Human preference votes
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-5.4 ($2.50/1M tokens) is 1.2x cheaper than Kimi K3 ($3.00/1M tokens).
For output processing, GPT-5.4 ($15.00/1M tokens) costs the same as Kimi K3 ($15.00/1M tokens).
In conclusion, Kimi K3 is more expensive than GPT-5.4.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Kimi K3 accepts 1,048,576 input tokens compared to GPT-5.4's 1,000,000 tokens. Kimi K3 can generate longer responses up to 1,048,576 tokens, while GPT-5.4 is limited to 128,000 tokens.
Input Capabilities
Supported data types and modalities
Both GPT-5.4 and Kimi K3 support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-5.4
Kimi K3
Release Timeline
When each model was launched
GPT-5.4 was released on 2026-03-05, while Kimi K3 was released on 2026-07-16.
Kimi K3 is 4 months newer than GPT-5.4.
Mar 5, 2026
4 months ago
Jul 16, 2026
1 days ago
4mo newerKnowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
GPT-5.4 is available from OpenAI. Kimi K3 is available from Moonshot AI.
GPT-5.4
Kimi K3
Outputs Comparison
Key Takeaways
GPT-5.4
View detailsOpenAI
Kimi K3
View detailsMoonshot AI
Detailed Comparison
Interactive Arena
Judge for yourself.
Run your own prompts against GPT-5.4 and Kimi K3 side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-5.4 vs Kimi K3.