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GPT 6 Astra vs Kimi K2 (0905)

At a glance

OpenAI's new flagship for demanding end-to-end work: advanced analysis, software engineering, deep research, scientific work, and document creation.

1.1M ctx$10.00/$50.00 per M

September 2025 checkpoint of Kimi K2 with improved capabilities.

262K ctx$0.60/$2.50 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper95%
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
262K
Context
100K
Max output
Sep 2025
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input$10.00/M tokens
Output$50.00/M tokens
Cache read$1.00/M tokens
Cache write$12.50/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input94%$0.60/M tokens
Output95%$2.50/M tokens
Chat with GPT 6 AstraGo to model
Chat with Kimi K2 (0905)Go to model
Frequently Asked Questions: GPT 6 Astra vs Kimi K2 (0905)▼

Which is better, GPT 6 Astra or Kimi K2 (0905)?

▼

Both GPT 6 Astra and Kimi K2 (0905) are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 6 Astra or Kimi K2 (0905)?

▼

Kimi K2 (0905) has a lower blended cost. GPT 6 Astra: $10.00 input / $50.00 output. Kimi K2 (0905): $0.60 input / $2.50 output.

Which has a larger context window, GPT 6 Astra or Kimi K2 (0905)?

▼

GPT 6 Astra has a larger context window: GPT 6 Astra supports 1.1M tokens vs Kimi K2 (0905) at 262K tokens.

Do both GPT 6 Astra and Kimi K2 (0905) support vision?

▼

GPT 6 Astra supports vision/image input, but Kimi K2 (0905) does not.

What are the key differences between GPT 6 Astra and Kimi K2 (0905)?

▼

Key differences: Kimi K2 (0905) is significantly cheaper; only GPT 6 Astra supports vision input; only GPT 6 Astra offers extended reasoning mode. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 6 Astra and Kimi K2 (0905) for free on idapt.app to see which performs better for your specific needs.

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