Model Comparison

ChatGPT-4o Latest vs Kimi K2-Thinking-0905

Kimi K2-Thinking-0905 significantly outperforms across most benchmarks. Kimi K2-Thinking-0905 is 5.1x cheaper per token.

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Performance Benchmarks

Comparative analysis across standard metrics

1 benchmarks

ChatGPT-4o Latest outperforms in 0 benchmarks, while Kimi K2-Thinking-0905 is better at 1 benchmark (GPQA).

Kimi K2-Thinking-0905 significantly outperforms across most benchmarks.

Thu May 14 2026 • llm-stats.com

Arena Performance

Human preference votes

Pricing Analysis

Price comparison per million tokens

Kimi K2-Thinking-0905 costs less

For input processing, ChatGPT-4o Latest ($2.50/1M tokens) is 5.3x more expensive than Kimi K2-Thinking-0905 ($0.47/1M tokens).

For output processing, ChatGPT-4o Latest ($10.00/1M tokens) is 5.0x more expensive than Kimi K2-Thinking-0905 ($2.00/1M tokens).

In conclusion, ChatGPT-4o Latest is more expensive than Kimi K2-Thinking-0905.*

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

Lowest available price from all providers

Thu May 14 2026 • llm-stats.com

ChatGPT-4o Latest

Input tokens$2.50

Output tokens$10.00

Best providerOpenAI

Kimi K2-Thinking-0905

Input tokens$0.47

Output tokens$2.00

Best providerDeepinfra

Notice missing or incorrect data?Start an Issue→

Context Window

Maximum input and output token capacity

Kimi K2-Thinking-0905 accepts 262,144 input tokens compared to ChatGPT-4o Latest's 128,000 tokens. Kimi K2-Thinking-0905 can generate longer responses up to 262,144 tokens, while ChatGPT-4o Latest is limited to 16,384 tokens.

ChatGPT-4o Latest

Input128,000 tokens

Output16,384 tokens

Kimi K2-Thinking-0905

Input262,144 tokens

Output262,144 tokens

Thu May 14 2026 • llm-stats.com

Input Capabilities

Supported data types and modalities

ChatGPT-4o Latest supports multimodal inputs, whereas Kimi K2-Thinking-0905 does not.

ChatGPT-4o Latest can handle both text and other forms of data like images, making it suitable for multimodal applications.

ChatGPT-4o Latest

Text

Images

Audio

Video

Kimi K2-Thinking-0905

Text

Images

Audio

Video

License

Usage and distribution terms

ChatGPT-4o Latest is licensed under a proprietary license, while Kimi K2-Thinking-0905 uses MIT.

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

ChatGPT-4o Latest

Proprietary

Closed source

Kimi K2-Thinking-0905

MIT

Open weights

Release Timeline

When each model was launched

ChatGPT-4o Latest was released on 2024-05-13, while Kimi K2-Thinking-0905 was released on 2025-09-05.

Kimi K2-Thinking-0905 is 16 months newer than ChatGPT-4o Latest.

ChatGPT-4o Latest

May 13, 2024

2.0 years ago

Kimi K2-Thinking-0905

Sep 5, 2025

8 months ago

1.3yr newer

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

ChatGPT-4o Latest is available from OpenAI. Kimi K2-Thinking-0905 is available from DeepInfra, Novita, Fireworks.

ChatGPT-4o Latest

OpenAI

Input Price:Input: $2.50/1MOutput Price:Output: $10.00/1M

Kimi K2-Thinking-0905

Deepinfra

Input Price:Input: $0.47/1MOutput Price:Output: $2.00/1M

Novita

Input Price:Input: $0.48/1MOutput Price:Output: $2.00/1M

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

ChatGPT-4o Latest

View details

OpenAI

Supports multimodal inputs

Kimi K2-Thinking-0905

View details

Moonshot AI

Larger context window (262,144 tokens)

Less expensive input tokens

Less expensive output tokens

Has open weights

Higher GPQA score (84.5% vs 84.0%)

Detailed Comparison

AI Model Comparison Table
Feature	ChatGPT-4o Latest	Kimi K2-Thinking-0905

FAQ

Common questions about ChatGPT-4o Latest vs Kimi K2-Thinking-0905.

Which is better, ChatGPT-4o Latest or Kimi K2-Thinking-0905?

Kimi K2-Thinking-0905 significantly outperforms across most benchmarks. ChatGPT-4o Latest is made by OpenAI and Kimi K2-Thinking-0905 is made by Moonshot AI. The best choice depends on your use case — compare their benchmark scores, pricing, and capabilities above.

How does ChatGPT-4o Latest compare to Kimi K2-Thinking-0905 in benchmarks?

ChatGPT-4o Latest scores GPQA: 84.0%. Kimi K2-Thinking-0905 scores AIME 2025: 100.0%, HMMT 2025: 97.5%, MMLU-Redux: 94.4%, FRAMES: 87.0%, MMLU-Pro: 84.6%.

Is ChatGPT-4o Latest cheaper than Kimi K2-Thinking-0905?

Kimi K2-Thinking-0905 is 5.3x cheaper for input tokens. ChatGPT-4o Latest costs $2.50/M input and $10.00/M output via openai. Kimi K2-Thinking-0905 costs $0.47/M input and $2.00/M output via deepinfra.

What are the context window sizes for ChatGPT-4o Latest and Kimi K2-Thinking-0905?

ChatGPT-4o Latest supports 128K tokens and Kimi K2-Thinking-0905 supports 262K tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between ChatGPT-4o Latest and Kimi K2-Thinking-0905?

Key differences include context window (128K vs 262K), input pricing ($2.50 vs $0.47/M), multimodal support (yes vs no), licensing (Proprietary vs MIT). See the full comparison above for benchmark-by-benchmark results.

Who makes ChatGPT-4o Latest and Kimi K2-Thinking-0905?

ChatGPT-4o Latest is developed by OpenAI and Kimi K2-Thinking-0905 is developed by Moonshot AI.