Kimi K2.5 vs GPT-5.4 nano Comparison

Comparing Kimi K2.5 and GPT-5.4 nano across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

6 benchmarks

Kimi K2.5 outperforms in 5 benchmarks (GPQA, Humanity's Last Exam, MMMU-Pro, OmniDocBench 1.5, Terminal-Bench 2.0), while GPT-5.4 nano is better at 1 benchmark (SWE-Bench Pro).

Kimi K2.5 significantly outperforms across most benchmarks.

Wed Mar 18 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

GPT-5.4 nano costs less

For input processing, Kimi K2.5 ($0.60/1M tokens) is 3.0x more expensive than GPT-5.4 nano ($0.20/1M tokens).

For output processing, Kimi K2.5 ($2.50/1M tokens) is 2.0x more expensive than GPT-5.4 nano ($1.25/1M tokens).

In conclusion, Kimi K2.5 is more expensive than GPT-5.4 nano.*

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

Lowest available price from all providers

Wed Mar 18 2026 • llm-stats.com

Kimi K2.5

Input tokens$0.60

Output tokens$2.50

Best providerFireworks

GPT-5.4 nano

Input tokens$0.20

Output tokens$1.25

Best providerOpenAI

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Context Window

Maximum input and output token capacity

GPT-5.4 nano accepts 400,000 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-5.4 nano is limited to 128,000 tokens.

Kimi K2.5

Input262,100 tokens

Output262,100 tokens

GPT-5.4 nano

Input400,000 tokens

Output128,000 tokens

Wed Mar 18 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi K2.5 and GPT-5.4 nano 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-5.4 nano

Text

Images

Audio

Video

License

Usage and distribution terms

Kimi K2.5 is licensed under MIT, while GPT-5.4 nano 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-5.4 nano

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi K2.5 was released on 2026-01-27, while GPT-5.4 nano was released on 2026-03-17.

GPT-5.4 nano is 2 months newer than Kimi K2.5.

Kimi K2.5

Jan 27, 2026

1 months ago

GPT-5.4 nano

Mar 17, 2026

1 days ago

1mo newer

Knowledge Cutoff

When training data ends

GPT-5.4 nano has a documented knowledge cutoff of 2025-08-31, while Kimi K2.5's cutoff date is not specified.

We can confirm GPT-5.4 nano's training data extends to 2025-08-31, but cannot make a direct comparison without Kimi K2.5's cutoff date.

Kimi K2.5

—

GPT-5.4 nano

Aug 2025

Provider Availability

Kimi K2.5 is available from Fireworks. GPT-5.4 nano is available from OpenAI. The availability of providers can affect quality of the model and reliability.