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Claude Opus 4.8 vs Kimi K2 (0905)

At a glance

Anthropic's most capable Opus yet, built for long-horizon autonomous agents and frontier coding.

891M ctx$5.00/$25.00 per M#4/92

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
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·Provider·OpenRouter· as of 2026-07-10
Capability
CapabilityECI89.2
Reasoning & Knowledge
Graduate Science91.0%Factual Recall39.5%
Math
Competition Math98.3%Research Math47.2%
Coding
Real-World Coding88.6%
Agentic
Novel Reasoning72.1%
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Cheaper89%
Capability
Capability—
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—Research Math—
Coding
Real-World Coding—
Agentic
Novel Reasoning—
Specs
1M
Context
128K
Max output
May 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$5.00/M tokens
Output$25.00/M tokens
Cache read$0.50/M tokens
Cache write$6.25/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input88%$0.60/M tokens
Output90%$2.50/M tokens
Chat with Claude Opus 4.8Go to model
Chat with Kimi K2 (0905)Go to model
Frequently Asked Questions: Claude Opus 4.8 vs Kimi K2 (0905)▼

Which is better, Claude Opus 4.8 or Kimi K2 (0905)?

▼

Both Claude Opus 4.8 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, Claude Opus 4.8 or Kimi K2 (0905)?

▼

Kimi K2 (0905) has a lower blended cost. Claude Opus 4.8: $5.00 input / $25.00 output. Kimi K2 (0905): $0.60 input / $2.50 output.

Which has a larger context window, Claude Opus 4.8 or Kimi K2 (0905)?

▼

Claude Opus 4.8 has a larger context window: Claude Opus 4.8 supports 1M tokens vs Kimi K2 (0905) at 262K tokens.

Do both Claude Opus 4.8 and Kimi K2 (0905) support vision?

▼

Claude Opus 4.8 supports vision/image input, but Kimi K2 (0905) does not.

What are the key differences between Claude Opus 4.8 and Kimi K2 (0905)?

▼

Key differences: Kimi K2 (0905) is significantly cheaper; only Claude Opus 4.8 supports vision input; only Claude Opus 4.8 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 Claude Opus 4.8 and Kimi K2 (0905) for free on idapt.app to see which performs better for your specific needs.

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