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Grok 4 Fast vs Claude Sonnet 5

At a glance

Fast version of Grok 4 with SOTA cost-efficiency and 2M-token context.

772M ctx#36/92

Anthropic's fifth-generation Sonnet — near-Opus intelligence at Sonnet speed and price.

801M ctx$2.00/$10.00 per M#26/92
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
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch ECI·Epoch AI· as of 2026-07-10
Capability
CapabilityECI77.0
Reasoning & Knowledge
Graduate Science—Factual Recall—
Math
Competition Math—
Agentic
Novel Reasoning5.3%
Reasoning
CI 72.7-84.7Provisional
CodingInsufficient data
AgenticInsufficient data
Sources:Epoch ECI·Epoch AI·OpenRouter· as of 2026-07-10
Smarter4%
Capability
CapabilityECI4%80.1
Reasoning & Knowledge
Graduate Science90.5%Factual Recall25.0%
Math
Competition Math94.7%
Agentic
Novel Reasoning—
Specs
2M
Context
33K
Max output
—
Released
1M
Context
128K
Max output
Jun 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Pricing not available
Live pricing, shown before you run
Input$2.00/M tokens
Output$10.00/M tokens
Cache read$0.20/M tokens
Cache write$2.50/M tokens
Web search$0.01/search
Chat with Grok 4 FastGo to model
Chat with Claude Sonnet 5Go to model
Frequently Asked Questions: Grok 4 Fast vs Claude Sonnet 5▼

Which is better, Grok 4 Fast or Claude Sonnet 5?

▼

Based on the Capability Index, Claude Sonnet 5 scores higher (80.1 vs 77.0). However, "better" depends on your use case — pricing, speed, context window, and specific capability needs all matter.

Which has a larger context window, Grok 4 Fast or Claude Sonnet 5?

▼

Grok 4 Fast has a larger context window: Grok 4 Fast supports 2M tokens vs Claude Sonnet 5 at 1M tokens.

Do both Grok 4 Fast and Claude Sonnet 5 support vision?

▼

Yes, both Grok 4 Fast and Claude Sonnet 5 support vision/image input.

What are the key differences between Grok 4 Fast and Claude Sonnet 5?

▼

Key differences: only Claude Sonnet 5 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 Grok 4 Fast and Claude Sonnet 5 for free on idapt.app to see which performs better for your specific needs.

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