We benchmarked DeepSeek V4 Flash, and it proved to be an absolute beast! The res
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AlphaSignalAI
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AlphaSignalAI
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Terms in this piece · Glossary
token — The chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.
AI agent — An AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.
Why it matters
Cache-read pricing, not raw tokenThe chunk of text a model reads and writes in — roughly three-quarters of a word — and the unit AI usage is billed in.Full definition → count, is what decides the bill on long AI agentAn AI system that doesn't just answer once but works toward a goal in a loop — taking actions, reading the results, and deciding what to do next.Full definition → runs, and this puts per-fix costs on the same task across models.
Transcript
We benchmarked DeepSeek V4 Flash, and it proved to be an absolute beast!
The results confirmed the claim that it is around 100× cheaper than Fable 5.
Here’s what stood out:
> @deepseek_ai V4 Flash ranked #1 at $0.004 per fix and $0.21 total
> @grok 4.5 ranked #2 and was the fastest model with a perfect score at 55 seconds
> @claudeai Fable 5 was the most expensive model with a perfect score at $0.389 per fix and $20.99 total
How is this possible?
Cheap cache reads.
It actually processed more tokens than Fable 5, but most of its repeated context was billed at a discounted cache rate. This kept the total bill low even across millions of agent tokens.
DeepSeek V4 Flash wasn’t the fastest model, but it delivered the strongest combination of debugging accuracy and cost.
Full benchmark results and breakdown below.
