Model Comparison

Kimi K2.5 vs GPT-5.5 Pro

GPT-5.5 Pro significantly outperforms across most benchmarks. Kimi K2.5 is 56.3x cheaper per token.

Want to compare interactively?Try the playground

Performance Benchmarks

Comparative analysis across standard metrics

2 benchmarks

Kimi K2.5 outperforms in 0 benchmarks, while GPT-5.5 Pro is better at 2 benchmarks (BrowseComp, Humanity's Last Exam).

GPT-5.5 Pro significantly outperforms across most benchmarks.

Wed May 13 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2.5 costs less

For input processing, Kimi K2.5 ($0.60/1M tokens) is 50.0x cheaper than GPT-5.5 Pro ($30.00/1M tokens).

For output processing, Kimi K2.5 ($3.00/1M tokens) is 60.0x cheaper than GPT-5.5 Pro ($180.00/1M tokens).

In conclusion, GPT-5.5 Pro is more expensive than Kimi K2.5.*

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

Lowest available price from all providers

Wed May 13 2026 • llm-stats.com

Kimi K2.5

Input tokens$0.60

Output tokens$3.00

Best providerFireworks

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 K2.5's 262,100 tokens. Kimi K2.5 can generate longer responses up to 262,100 tokens, while GPT-5.5 Pro is limited to 128,000 tokens.

Kimi K2.5

Input262,100 tokens

Output262,100 tokens

GPT-5.5 Pro

Input1,050,000 tokens

Output128,000 tokens

Wed May 13 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi K2.5 and GPT-5.5 Pro support multimodal inputs.

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

Kimi K2.5

Text

Images

Audio

Video

GPT-5.5 Pro

Text

Images

Audio

Video

License

Usage and distribution terms

Kimi K2.5 is licensed under MIT, while GPT-5.5 Pro uses a proprietary license.

License differences may affect how you can use these models in commercial or open-source projects.

Kimi K2.5

MIT

Open weights

GPT-5.5 Pro

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi K2.5 was released on 2026-01-27, while GPT-5.5 Pro was released on 2026-04-23.

GPT-5.5 Pro is 3 months newer than Kimi K2.5.

Kimi K2.5

Jan 27, 2026

3 months ago

GPT-5.5 Pro

Apr 23, 2026

2 weeks ago

2mo newer

Knowledge Cutoff

When training data ends

GPT-5.5 Pro has a documented knowledge cutoff of 2025-12-01, while Kimi K2.5'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 K2.5's cutoff date.

Kimi K2.5

—

GPT-5.5 Pro

Dec 2025

Provider Availability

Kimi K2.5 is available from Fireworks, Moonshot AI. GPT-5.5 Pro is available from OpenAI.

Kimi K2.5

Fireworks

Input Price:Input: $0.60/1MOutput Price:Output: $3.00/1M

Unknown Organization

Input Price:Input: $0.60/1MOutput Price:Output: $3.00/1M

GPT-5.5 Pro

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

Kimi K2.5

View details

Moonshot AI

Less expensive input tokens

Less expensive output tokens

Has open weights

GPT-5.5 Pro

View details

OpenAI

Larger context window (1,050,000 tokens)

Higher BrowseComp score (90.1% vs 74.9%)

Higher Humanity's Last Exam score (57.2% vs 50.2%)

Detailed Comparison

AI Model Comparison Table
Feature	Kimi K2.5	GPT-5.5 Pro

FAQ

Common questions about Kimi K2.5 vs GPT-5.5 Pro.

Which is better, Kimi K2.5 or GPT-5.5 Pro?

GPT-5.5 Pro significantly outperforms across most benchmarks. Kimi K2.5 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 K2.5 compare to GPT-5.5 Pro in benchmarks?

Kimi K2.5 scores AIME 2025: 96.1%, HMMT 2025: 95.4%, InfoVQAtest: 92.6%, OCRBench: 92.3%, MathVista-Mini: 90.1%. 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 K2.5 cheaper than GPT-5.5 Pro?

Kimi K2.5 is 50.0x cheaper for input tokens. Kimi K2.5 costs $0.60/M input and $3.00/M output via fireworks. GPT-5.5 Pro costs $30.00/M input and $180.00/M output via openai.

What are the context window sizes for Kimi K2.5 and GPT-5.5 Pro?

Kimi K2.5 supports 262K 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 K2.5 and GPT-5.5 Pro?

Key differences include context window (262K vs 1.1M), input pricing ($0.60 vs $30.00/M), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.

Who makes Kimi K2.5 and GPT-5.5 Pro?

Kimi K2.5 is developed by Moonshot AI and GPT-5.5 Pro is developed by OpenAI.