[KongchangAI]
Unverified50% confidenceBenchmarkExact time

After the switch, DeepSeek V4 Flash performed comparably to Sonnet 5 in the vast majority of scenarios, falling slightly short only in a very small number of cases.

1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
9/11/2026
First Seen
Valid until: 12/10/2026

Sources

Agent Evaluation in Practice: Switching from Sonnet to DeepSeek for a 10x Cost Reduction

Related Entities

DeepSeek V4 FlashmodelSonnet 5model

Related Claims

UnverifiedV4.1 Flash surpassed Opus 5 on the DeepSWE benchmark by a narrow margin of 0.2 points.72% similarUnverifiedV4.1 Flash took first place on the DeepSWE, CyberDream, and AutomationBench agent benchmarks.68% similar

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