Model Comparison

Kimi K3 vs o3-proWhich is better in 2026?

Comparing Kimi K3 and o3-pro across benchmarks, pricing, and capabilities.

Verdict: Kimi K3 vs o3-pro — which is better?

Kimi K3 (by Moonshot AI) and o3-pro (by OpenAI) 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.

On price, Kimi K3 is roughly 5.8x 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 Kimi K3 if…

  • cost matters — it's about 5.8x cheaper per token
  • you process long inputs — it offers a 1,048,576 token context window
  • you want the most recent training data — it shipped Jul 2026

Choose o3-pro if…

  • you want predictable pricing at $20.00/M input and $80.00/M output

Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Kimi K3 and o3-prodon't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K3 costs less

For input processing, Kimi K3 ($3.00/1M tokens) is 6.7x cheaper than o3-pro ($20.00/1M tokens).

For output processing, Kimi K3 ($15.00/1M tokens) is 5.3x cheaper than o3-pro ($80.00/1M tokens).

In conclusion, o3-pro is more expensive than Kimi K3.*

* Using a 3:1 ratio of input to output tokens

Lowest available price from all providers
Sun Jul 26 2026 • llm-stats.com
Moonshot AI
Kimi K3
Input tokens$3.00
Output tokens$15.00
Best providerUnknown Organization
OpenAI
o3-pro
Input tokens$20.00
Output tokens$80.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Kimi K3 accepts 1,048,576 input tokens compared to o3-pro's 200,000 tokens. Kimi K3 can generate longer responses up to 1,048,576 tokens, while o3-pro is limited to 100,000 tokens.

Moonshot AI
Kimi K3
Input1,048,576 tokens
Output1,048,576 tokens
OpenAI
o3-pro
Input200,000 tokens
Output100,000 tokens
Sun Jul 26 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi K3 and o3-pro support multimodal inputs.

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

Kimi K3

Text
Images
Audio
Video

o3-pro

Text
Images
Audio
Video

Release Timeline

When each model was launched

Kimi K3 was released on 2026-07-16, while o3-pro was released on 2025-06-10.

Kimi K3 is 13 months newer than o3-pro.

Kimi K3

Jul 16, 2026

1 weeks ago

1.1yr newer
o3-pro

Jun 10, 2025

1.1 years ago

Knowledge Cutoff

When training data ends

o3-pro has a documented knowledge cutoff of 2024-05-31, while Kimi K3's cutoff date is not specified.

We can confirm o3-pro's training data extends to 2024-05-31, but cannot make a direct comparison without Kimi K3's cutoff date.

Kimi K3

—

o3-pro

May 2024

Provider Availability

Kimi K3 is available from Moonshot AI. o3-pro is available from OpenAI.

Kimi K3

moonshot logo
Unknown Organization
Input Price:Input: $3.00/1MOutput Price:Output: $15.00/1M

o3-pro

openai logo
OpenAI
Input Price:Input: $20.00/1MOutput Price:Output: $80.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Moonshot AI
Larger context window (1,048,576 tokens)
Less expensive input tokens
Less expensive output tokens
Has open weights
OpenAI

No standout differentiators in the data we have for this pair.

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Kimi K3 and o3-pro side-by-side, then vote on the output you prefer.

Kimi K3
✓ Preferred
o3-pro
Open in Playground
AI Model Comparison Table
Feature
Moonshot AI
Kimi K3
OpenAI
o3-pro

FAQ

Common questions about Kimi K3 vs o3-pro.

Which is better, Kimi K3 or o3-pro?

Kimi K3 (Moonshot AI) and o3-pro (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.

How does Kimi K3 compare to o3-pro in benchmarks?

Kimi K3 scores MathVision: 97.8%, DeepSearchQA: 95.0%, GPQA: 93.5%, CharXiv-R: 91.3%, BrowseComp: 91.2%.

Is Kimi K3 cheaper than o3-pro?

Kimi K3 is 6.7x cheaper for input tokens. Kimi K3 costs $3.00/M input and $15.00/M output via moonshot. o3-pro costs $20.00/M input and $80.00/M output via openai.

What are the context window sizes for Kimi K3 and o3-pro?

Kimi K3 supports 1.0M tokens and o3-pro supports 200K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Kimi K3 and o3-pro?

Key differences include context window (1.0M vs 200K), input pricing ($3.00 vs $20.00/M), licensing (Unknown vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K3 and o3-pro?

Kimi K3 is developed by Moonshot AI and o3-pro is developed by OpenAI.

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