GPT-6 Astra vs Kimi K3.1 Pro
GPT-6 Astra and Kimi K3.1 Pro are closely matched at 57.5 and 55.5 on the LLM Stats Score. Kimi K3.1 Pro is 5.0x cheaper per token.
OpenAI · Moonshot AI · Updated for 2026
Which is better?
GPT-6 Astra and Kimi K3.1 Pro are closely matched on the overall LLM Stats Score at 57.5 and 55.5.
In the 8 individual benchmarks reported for both models, GPT-6 Astra wins 6; this is a narrower head-to-head signal than the composite indexes.
On price, Kimi K3.1 Pro is roughly 5.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-6 Astra also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.
Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.
Choose GPT-6 Astra
- you value its reported benchmark strengths — it wins 6 of 8 exact shared results
- you process long inputs — it offers a 1,050,000 token context window
Choose Kimi K3.1 Pro
- cost matters — it's about 5.0x cheaper per token
- you want the most recent training data — it shipped Oct 2026
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
22 reported for GPT-6 Astra · 30 for Kimi K3.1 Pro
GPT-6 Astra outperforms in 6 benchmarks (Agents' Last Exam, BenchCAD (with Python tool), ExploitBench, ExploitGym, GPQA, Terminal-Bench-Science 0.1), while Kimi K3.1 Pro is better at 2 benchmarks (BrowseComp, Terminal-Bench 4.0).
GPT-6 Astra shows notably better performance in the majority of benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-6 Astra ($10.00/1M tokens) is 5.0x more expensive than Kimi K3.1 Pro ($2.00/1M tokens).
For output processing, GPT-6 Astra ($50.00/1M tokens) is 5.0x more expensive than Kimi K3.1 Pro ($10.00/1M tokens).
In conclusion, GPT-6 Astra is more expensive than Kimi K3.1 Pro.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-6 Astra accepts 1,050,000 input tokens compared to Kimi K3.1 Pro's 1,048,576 tokens. Kimi K3.1 Pro can generate longer responses up to 1,048,576 tokens, while GPT-6 Astra is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-6 Astra and Kimi K3.1 Pro support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-6 Astra
Kimi K3.1 Pro
Release Timeline
When each model was launched
GPT-6 Astra was released on 2026-09-04, while Kimi K3.1 Pro was released on 2026-10-23.
Kimi K3.1 Pro is 2 months newer than GPT-6 Astra.
Sep 4, 2026
1 months ago
Oct 23, 2026
4 days ago
1mo newerKnowledge Cutoff
When training data ends
GPT-6 Astra has a documented knowledge cutoff of 2026-04-30, while Kimi K3.1 Pro's cutoff date is not specified.
We can confirm GPT-6 Astra's training data extends to 2026-04-30, but cannot make a direct comparison without Kimi K3.1 Pro's cutoff date.
Apr 2026
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Provider Availability
GPT-6 Astra is available from OpenAI. Kimi K3.1 Pro is available from Moonshot AI.
GPT-6 Astra
Kimi K3.1 Pro
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-6 Astra and Kimi K3.1 Pro side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-6 Astra vs Kimi K3.1 Pro.