Model Comparison

Kimi K2.5 vs GPT-5.3 Chat

Comparing Kimi K2.5 and GPT-5.3 Chat across benchmarks, pricing, and capabilities.

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Performance Benchmarks

Comparative analysis across standard metrics

No common benchmarks found

Kimi K2.5 and GPT-5.3 Chat don'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 K2.5 costs less

For input processing, Kimi K2.5 ($0.60/1M tokens) is 2.9x cheaper than GPT-5.3 Chat ($1.75/1M tokens).

For output processing, Kimi K2.5 ($3.00/1M tokens) is 4.7x cheaper than GPT-5.3 Chat ($14.00/1M tokens).

In conclusion, GPT-5.3 Chat is more expensive than Kimi K2.5.*

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

Lowest available price from all providers
Fri May 01 2026 • llm-stats.com
Moonshot AI
Kimi K2.5
Input tokens$0.60
Output tokens$3.00
Best providerFireworks
OpenAI
GPT-5.3 Chat
Input tokens$1.75
Output tokens$14.00
Best providerOpenAI
Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Kimi K2.5 accepts 262,100 input tokens compared to GPT-5.3 Chat's 128,000 tokens. Kimi K2.5 can generate longer responses up to 262,100 tokens, while GPT-5.3 Chat is limited to 16,384 tokens.

Moonshot AI
Kimi K2.5
Input262,100 tokens
Output262,100 tokens
OpenAI
GPT-5.3 Chat
Input128,000 tokens
Output16,384 tokens
Fri May 01 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both Kimi K2.5 and GPT-5.3 Chat 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-5.3 Chat

Text
Images
Audio
Video

License

Usage and distribution terms

Kimi K2.5 is licensed under MIT, while GPT-5.3 Chat 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-5.3 Chat

Proprietary

Closed source

Release Timeline

When each model was launched

Kimi K2.5 was released on 2026-01-27, while GPT-5.3 Chat was released on 2026-03-04.

GPT-5.3 Chat is 1 month newer than Kimi K2.5.

Kimi K2.5

Jan 27, 2026

3 months ago

GPT-5.3 Chat

Mar 4, 2026

1 months ago

1mo newer

Knowledge Cutoff

When training data ends

GPT-5.3 Chat has a documented knowledge cutoff of 2025-08-31, while Kimi K2.5's cutoff date is not specified.

We can confirm GPT-5.3 Chat'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-5.3 Chat

Aug 2025

Provider Availability

Kimi K2.5 is available from Fireworks, Moonshot AI. GPT-5.3 Chat is available from OpenAI.

Kimi K2.5

fireworks logo
Fireworks
Input Price:Input: $0.60/1MOutput Price:Output: $3.00/1M
moonshot logo
Unknown Organization
Input Price:Input: $0.60/1MOutput Price:Output: $3.00/1M

GPT-5.3 Chat

openai logo
OpenAI
Input Price:Input: $1.75/1MOutput Price:Output: $14.00/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

Moonshot AI
Larger context window (262,100 tokens)
Less expensive input tokens
Less expensive output tokens
Has open weights
OpenAI

Detailed Comparison

AI Model Comparison Table
Feature
Moonshot AI
Kimi K2.5
OpenAI
GPT-5.3 Chat

FAQ

Common questions about Kimi K2.5 vs GPT-5.3 Chat

Kimi K2.5 (Moonshot AI) and GPT-5.3 Chat (OpenAI) each have strengths in different areas. Compare their benchmark scores, pricing, context windows, and capabilities above to determine which fits your needs.
Kimi K2.5 scores AIME 2025: 96.1%, HMMT 2025: 95.4%, InfoVQAtest: 92.6%, OCRBench: 92.3%, MathVista-Mini: 90.1%. GPT-5.3 Chat scores HealthBench: 54.1%, HealthBench Hard: 25.9%.
Kimi K2.5 is 2.9x cheaper for input tokens. Kimi K2.5 costs $0.60/M input and $3.00/M output via fireworks. GPT-5.3 Chat costs $1.75/M input and $14.00/M output via openai.
Kimi K2.5 supports 262K tokens and GPT-5.3 Chat supports 128K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (262K vs 128K), input pricing ($0.60 vs $1.75/M), licensing (MIT vs Proprietary). See the full comparison above for benchmark-by-benchmark results.
Kimi K2.5 is developed by Moonshot AI and GPT-5.3 Chat is developed by OpenAI.