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GPT 6 Astra vs Kimi K3

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

MoonshotAI's 2.8T-parameter flagship for complex coding, knowledge work, and long-horizon agent runs.

1.0M ctx$3.00/$15.00 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
Reasoning & Knowledge
Graduate Science—Expert-Level—
Agentic
Terminal Tasks—
Reasoning
CodingInsufficient data
MathInsufficient data
Sources:Provider·OpenRouter· as of 2026-07-16
Cheaper70%
Reasoning & Knowledge
Graduate Science93.5%Expert-Level43.5%
Agentic
Terminal Tasks88.3%
Specs
1.1M
Context
128K
Max output
Sep 2026
Released
1.0M
Context
16K
Max output
Jul 2026
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
Input70%$3.00/M tokens
Output70%$15.00/M tokens
Cache read70%$0.30/M tokens
Chat with GPT 6 AstraGo to model
Chat with Kimi K3Go to model
Frequently Asked Questions: GPT 6 Astra vs Kimi K3▼

Which is better, GPT 6 Astra or Kimi K3?

▼

Both GPT 6 Astra and Kimi K3 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 K3?

▼

Kimi K3 has a lower blended cost. GPT 6 Astra: $10.00 input / $50.00 output. Kimi K3: $3.00 input / $15.00 output.

Which has a larger context window, GPT 6 Astra or Kimi K3?

▼

GPT 6 Astra has a larger context window: GPT 6 Astra supports 1.1M tokens vs Kimi K3 at 1M tokens.

Do both GPT 6 Astra and Kimi K3 support vision?

▼

Yes, both GPT 6 Astra and Kimi K3 support vision/image input.

What are the key differences between GPT 6 Astra and Kimi K3?

▼

Key differences: Kimi K3 is significantly cheaper. 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 K3 for free on idapt.app to see which performs better for your specific needs.

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