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GPT-6 Astra vs Kimi-k1.5

GPT-6 Astra leads the LLM Stats Score 58.5 to 17.1.

OpenAI · Moonshot AI · Updated for 2026

Which is better?

GPT-6 Astra leads the overall LLM Stats Score 58.5 to 17.1, ranking #3 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose GPT-6 Astra

  • overall performance matters — it scores 58.5 and ranks #3 on LLM Stats
  • your work emphasizes reasoning — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Kimi-k1.5

  • you are already invested in the Moonshot AI ecosystem

At a glance

The differences that matter most.

GPT-6 Astra
OpenAI
Kimi-k1.5
Moonshot AI
Core performance indexes
LLM Stats Score
58.5
#3
17.1
#234
Reasoning
57.3
#2
16.4
#231
Cost, coverage & limits
Benchmark wins
—
—
Input price
$10.00 / M
— / M
Output price
$50.00 / M
— / M
Context window
1,050,000
—

Capability indexes

Additional strengths measured across groups of related public benchmarks

3 shared
Index
GPT-6 Astra
Kimi-k1.5
Math
33.5#56
20.2#166
Vision
40.2#4
11.0#123
Multimodal
37.5#5
14.6#105
Conservative TrueSkill rating · higher is betterHow scores work

Individual benchmarks

22 reported for GPT-6 Astra · 9 for Kimi-k1.5

No common benchmarks found

GPT-6 Astra and Kimi-k1.5don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only GPT-6 Astra specifies input context (1,050,000 tokens). Only GPT-6 Astra specifies output context (128,000 tokens).

OpenAI
GPT-6 Astra
Input1,050,000 tokens
Output128,000 tokens
Moonshot AI
Kimi-k1.5
Input- tokens
Output- tokens
Fri Oct 16 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

Both GPT-6 Astra and Kimi-k1.5 support multimodal inputs.

They are both capable of processing various types of data, offering versatility in application.

GPT-6 Astra

Text
Images
Audio
Video

Kimi-k1.5

Text
Images
Audio
Video

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

GPT-6 Astra

Proprietary

Closed source

Kimi-k1.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Astra was released on 2026-09-04, while Kimi-k1.5 was released on 2025-01-20.

GPT-6 Astra is 20 months newer than Kimi-k1.5.

GPT-6 Astra

Sep 4, 2026

1 months ago

1.6yr newer
Kimi-k1.5

Jan 20, 2025

1.7 years ago

Knowledge Cutoff

When training data ends

GPT-6 Astra has a documented knowledge cutoff of 2026-04-30, while Kimi-k1.5'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-k1.5's cutoff date.

GPT-6 Astra

Apr 2026

Kimi-k1.5

—

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against GPT-6 Astra and Kimi-k1.5 side-by-side, then vote on the output you prefer.

GPT-6 Astra
✓ Preferred
Kimi-k1.5
Open in Playground

FAQ

Common questions about GPT-6 Astra vs Kimi-k1.5.

Which is better, GPT-6 Astra or Kimi-k1.5?

GPT-6 Astra leads the LLM Stats Score 58.5 to 17.1. GPT-6 Astra is made by OpenAI and Kimi-k1.5 is made by Moonshot AI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does GPT-6 Astra compare to Kimi-k1.5 in benchmarks?

GPT-6 Astra scores ExploitBench: 100.0%, ARC-AGI-3: 99.9%, ARC-AGI: 98.5%, FrontierMath Tier 4 (v2): 97.6%, GPQA: 96.0%. Kimi-k1.5 scores MATH-500: 96.2%, CLUEWSC: 91.4%, C-Eval: 88.3%, MMLU: 87.4%, IFEval: 87.2%.

What are the context window sizes for GPT-6 Astra and Kimi-k1.5?

GPT-6 Astra supports 1.1M tokens and Kimi-k1.5 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between GPT-6 Astra and Kimi-k1.5?

Key differences include LLM Stats Score (58.5 vs 17.1). See the full comparison above for benchmark-by-benchmark results.

Who makes GPT-6 Astra and Kimi-k1.5?

GPT-6 Astra is developed by OpenAI and Kimi-k1.5 is developed by Moonshot AI.

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