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GPT-6 Sol vs Kimi-k1.5

GPT-6 Sol leads the LLM Stats Score 49.4 to 17.2.

OpenAI · Moonshot AI · Updated for 2026

Which is better?

GPT-6 Sol leads the overall LLM Stats Score 49.4 to 17.2, ranking #21 overall.

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

Choose GPT-6 Sol

  • overall performance matters — it scores 49.4 and ranks #21 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 Sol
OpenAI
Kimi-k1.5
Moonshot AI
Core performance indexes
LLM Stats Score
49.4
#21
17.2
#224
Reasoning
45.6
#29
16.4
#221
Cost, coverage & limits
Benchmark wins
—
—
Input price
$2.00 / M
— / M
Output price
$10.00 / M
— / M
Context window
1,050,000
—

Individual benchmarks

5 reported for GPT-6 Sol · 9 for Kimi-k1.5

No common benchmarks found

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

OpenAI
GPT-6 Sol
Input1,050,000 tokens
Output128,000 tokens
Moonshot AI
Kimi-k1.5
Input- tokens
Output- tokens
Wed Sep 23 2026 • llm-stats.com

Input capabilities

Documented input modalities across available providers

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

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

GPT-6 Sol

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 Sol

Proprietary

Closed source

Kimi-k1.5

Proprietary

Closed source

Release Timeline

When each model was launched

GPT-6 Sol was released on 2026-09-22, while Kimi-k1.5 was released on 2025-01-20.

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

GPT-6 Sol

Sep 22, 2026

0 days ago

1.7yr newer
Kimi-k1.5

Jan 20, 2025

1.7 years ago

Knowledge Cutoff

When training data ends

GPT-6 Sol has a documented knowledge cutoff of 2026-04-20, while Kimi-k1.5's cutoff date is not specified.

We can confirm GPT-6 Sol's training data extends to 2026-04-20, but cannot make a direct comparison without Kimi-k1.5's cutoff date.

GPT-6 Sol

Apr 2026

Kimi-k1.5

—

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Judge for yourself.

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

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

FAQ

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

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

GPT-6 Sol leads the LLM Stats Score 49.4 to 17.2. GPT-6 Sol 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 Sol compare to Kimi-k1.5 in benchmarks?

GPT-6 Sol scores DeepSWE 1.1: 68.8%, OSWorld 2.0: 64.4%, Agents' Last Exam: 56.4%, FrontierCode 1.1: 49.3%, AutomationBench v1.0.6: 33.2%. 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 Sol and Kimi-k1.5?

GPT-6 Sol 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 Sol and Kimi-k1.5?

Key differences include LLM Stats Score (49.4 vs 17.2). See the full comparison above for benchmark-by-benchmark results.

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

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

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