Model Comparison

GPT-5.4 vs Kimi K2.5

GPT-5.4 significantly outperforms across most benchmarks. Kimi K2.5 is 5.2x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

7 benchmarks

GPT-5.4 outperforms in 6 benchmarks (BrowseComp, GPQA, MMMU-Pro, OmniDocBench 1.5, SWE-Bench Pro, Terminal-Bench 2.0), while Kimi K2.5 is better at 1 benchmark (Humanity's Last Exam).

GPT-5.4 significantly outperforms across most benchmarks.

Fri Apr 10 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2.5 costs less

For input processing, GPT-5.4 ($2.50/1M tokens) is 4.2x more expensive than Kimi K2.5 ($0.60/1M tokens).

For output processing, GPT-5.4 ($15.00/1M tokens) is 6.0x more expensive than Kimi K2.5 ($2.50/1M tokens).

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

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

Lowest available price from all providers
Fri Apr 10 2026 • llm-stats.com
OpenAI
GPT-5.4
Input tokens$2.50
Output tokens$15.00
Best providerOpenAI
Moonshot AI
Kimi K2.5
Input tokens$0.60
Output tokens$2.50
Best providerFireworks
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Context Window

Maximum input and output token capacity

GPT-5.4 accepts 1,000,000 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 is limited to 128,000 tokens.

OpenAI
GPT-5.4
Input1,000,000 tokens
Output128,000 tokens
Moonshot AI
Kimi K2.5
Input262,100 tokens
Output262,100 tokens
Fri Apr 10 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

Both GPT-5.4 and Kimi K2.5 support multimodal inputs.

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

GPT-5.4

Text
Images
Audio
Video

Kimi K2.5

Text
Images
Audio
Video

License

Usage and distribution terms

GPT-5.4 is licensed under a proprietary license, while Kimi K2.5 uses MIT.

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

GPT-5.4

Proprietary

Closed source

Kimi K2.5

MIT

Open weights

Release Timeline

When each model was launched

GPT-5.4 was released on 2026-03-05, while Kimi K2.5 was released on 2026-01-27.

GPT-5.4 is 1 month newer than Kimi K2.5.

GPT-5.4

Mar 5, 2026

1 months ago

1mo newer
Kimi K2.5

Jan 27, 2026

2 months ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Provider Availability

GPT-5.4 is available from OpenAI. Kimi K2.5 is available from Fireworks.

GPT-5.4

openai logo
OpenAI
Input Price:Input: $2.50/1MOutput Price:Output: $15.00/1M

Kimi K2.5

fireworks logo
Fireworks
Input Price:Input: $0.60/1MOutput Price:Output: $2.50/1M
* Prices shown are per million tokens

Outputs Comparison

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Key Takeaways

OpenAI
Larger context window (1,000,000 tokens)
Higher BrowseComp score (82.7% vs 74.9%)
Higher GPQA score (92.8% vs 87.6%)
Higher MMMU-Pro score (81.2% vs 78.5%)
Higher OmniDocBench 1.5 score (89.1% vs 88.8%)
Higher SWE-Bench Pro score (57.7% vs 50.7%)
Higher Terminal-Bench 2.0 score (75.1% vs 50.8%)
Moonshot AI
Less expensive input tokens
Less expensive output tokens
Has open weights
Higher Humanity's Last Exam score (50.2% vs 39.8%)

Detailed Comparison

AI Model Comparison Table
Feature
OpenAI
GPT-5.4
Moonshot AI
Kimi K2.5

FAQ

Common questions about GPT-5.4 vs Kimi K2.5

GPT-5.4 significantly outperforms across most benchmarks. GPT-5.4 is made by OpenAI and Kimi K2.5 is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.
GPT-5.4 scores Tau2 Telecom: 98.9%, ARC-AGI: 93.7%, Graphwalks BFS <128k: 93.0%, GPQA: 92.8%, Graphwalks parents <128k: 89.8%. Kimi K2.5 scores AIME 2025: 96.1%, HMMT 2025: 95.4%, InfoVQAtest: 92.6%, OCRBench: 92.3%, MathVista-Mini: 90.1%.
Kimi K2.5 is 4.2x cheaper for input tokens. GPT-5.4 costs $2.50/M input and $15.00/M output via openai. Kimi K2.5 costs $0.60/M input and $2.50/M output via fireworks.
GPT-5.4 supports 1.0M tokens and Kimi K2.5 supports 262K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.
Key differences include context window (1.0M vs 262K), input pricing ($2.50 vs $0.60/M), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.
GPT-5.4 is developed by OpenAI and Kimi K2.5 is developed by Moonshot AI.