Model Comparison

Kimi K3 vs GPT-5.5 ProWhich is better in 2026?

Both models are evenly matched across the benchmarks. Kimi K3 is 11.3x cheaper per token.

Verdict: Kimi K3 vs GPT-5.5 Pro — which is better?

Kimi K3 (by Moonshot AI) and GPT-5.5 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.

Kimi K3 outperforms in 1 benchmarks (BrowseComp), while GPT-5.5 Pro is better at 1 benchmark (Humanity's Last Exam). Both models are evenly matched across the benchmarks.

On price, Kimi K3 is roughly 11.3x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.

GPT-5.5 Pro also accepts a larger context window (1,050,000 input tokens), making it the stronger choice for long documents and large codebases.

Choose Kimi K3 if…

  • cost matters — it's about 11.3x cheaper per token
  • you want the most recent training data — it shipped Jul 2026

Choose GPT-5.5 Pro if…

  • you process long inputs — it offers a 1,050,000 token context window

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Kimi K3 outperforms in 1 benchmarks (BrowseComp), while GPT-5.5 Pro is better at 1 benchmark (Humanity's Last Exam).

Both models are evenly matched across the benchmarks.

Fri Jul 17 2026 • llm-stats.com

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 10.0x cheaper than GPT-5.5 Pro ($30.00/1M tokens).

For output processing, Kimi K3 ($15.00/1M tokens) is 12.0x cheaper than GPT-5.5 Pro ($180.00/1M tokens).

In conclusion, GPT-5.5 Pro is more expensive than Kimi K3.*

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

Lowest available price from all providers
Fri Jul 17 2026 • llm-stats.com
Moonshot AI
Kimi K3
Input tokens$3.00
Output tokens$15.00
Best providerUnknown Organization
OpenAI
GPT-5.5 Pro
Input tokens$30.00
Output tokens$180.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

GPT-5.5 Pro accepts 1,050,000 input tokens compared to Kimi K3's 1,048,576 tokens. Kimi K3 can generate longer responses up to 1,048,576 tokens, while GPT-5.5 Pro is limited to 128,000 tokens.

Moonshot AI
Kimi K3
Input1,048,576 tokens
Output1,048,576 tokens
OpenAI
GPT-5.5 Pro
Input1,050,000 tokens
Output128,000 tokens
Fri Jul 17 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi K3 and GPT-5.5 Pro support multimodal inputs.

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

Kimi K3

Text
Images
Audio
Video

GPT-5.5 Pro

Text
Images
Audio
Video

Release Timeline

When each model was launched

Kimi K3 was released on 2026-07-16, while GPT-5.5 Pro was released on 2026-04-23.

Kimi K3 is 3 months newer than GPT-5.5 Pro.

Kimi K3

Jul 16, 2026

1 days ago

2mo newer
GPT-5.5 Pro

Apr 23, 2026

2 months ago

Knowledge Cutoff

When training data ends

GPT-5.5 Pro has a documented knowledge cutoff of 2025-12-01, while Kimi K3's cutoff date is not specified.

We can confirm GPT-5.5 Pro's training data extends to 2025-12-01, but cannot make a direct comparison without Kimi K3's cutoff date.

Kimi K3

—

GPT-5.5 Pro

Dec 2025

Provider Availability

Kimi K3 is available from Moonshot AI. GPT-5.5 Pro is available from OpenAI.

Kimi K3

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

GPT-5.5 Pro

openai logo
OpenAI
Input Price:Input: $30.00/1MOutput Price:Output: $180.00/1M
* Prices shown are per million tokens

Outputs Comparison

Notice missing or incorrect data?Start an Issue discussion→

Key Takeaways

Moonshot AI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher BrowseComp score (91.2% vs 90.1%)
OpenAI
Larger context window (1,050,000 tokens)
Higher Humanity's Last Exam score (57.2% vs 56.0%)

Detailed Comparison

Interactive Arena

Judge for yourself.

Run your own prompts against Kimi K3 and GPT-5.5 Pro side-by-side, then vote on the output you prefer.

Kimi K3
✓ Preferred
GPT-5.5 Pro
Open in Playground
AI Model Comparison Table
Feature
Moonshot AI
Kimi K3
OpenAI
GPT-5.5 Pro

FAQ

Common questions about Kimi K3 vs GPT-5.5 Pro.

Which is better, Kimi K3 or GPT-5.5 Pro?

Both models are evenly matched across the benchmarks. Kimi K3 is made by Moonshot AI and GPT-5.5 Pro is made by OpenAI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does Kimi K3 compare to GPT-5.5 Pro in benchmarks?

Kimi K3 scores MathVision: 97.8%, DeepSearchQA: 95.0%, GPQA: 93.5%, CharXiv-R: 91.3%, BrowseComp: 91.2%. GPT-5.5 Pro scores BrowseComp: 90.1%, GDPval-MM: 82.3%, Humanity's Last Exam: 57.2%, FrontierMath: 39.6%, GeneBench: 33.2%.

Is Kimi K3 cheaper than GPT-5.5 Pro?

Kimi K3 is 10.0x cheaper for input tokens. Kimi K3 costs $3.00/M input and $15.00/M output via moonshot. GPT-5.5 Pro costs $30.00/M input and $180.00/M output via openai.

What are the context window sizes for Kimi K3 and GPT-5.5 Pro?

Kimi K3 supports 1.0M tokens and GPT-5.5 Pro supports 1.1M 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 GPT-5.5 Pro?

Key differences include context window (1.0M vs 1.1M), input pricing ($3.00 vs $30.00/M), licensing (Unknown vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K3 and GPT-5.5 Pro?

Kimi K3 is developed by Moonshot AI and GPT-5.5 Pro is developed by OpenAI.

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