Reasonix
Coding agent harness for DeepSeek models, built to maximize prefix-cache hits.
Recommended as a DeepSeek agent harness whose prefix-cache alignment yields mostly cache-hit tokens,12345 letting commenters run long coding sessions and large code analyses for pennies.6789 Few complaints appear; the main caveat is that it requires sending data to China,10 with some attentional drift in very large contexts and open questions about cache benefits via OpenRouter.111213
Why people recommend it
Low cost · 3
Commenters say DeepSeek through Reasonix costs pennies, making requests nearly free.
“With reasonix or pi, I can code all day long and pay a few pennies for it.”
“with Reasonix, DeepSeek is free real estate. Seems to just go and go for pennies.”
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“I use Reasonix with planning-with-files and that's been better than even openspec.”
Cache hits · 3
Its alignment to DeepSeek's prefix cache yields 95%+ cache-hit input tokens on long runs.
“I recommend their Reasonix harness strongly, due to its alignment to DeepSeek's prefix cache.”
“And Reasonix + Deepseek is mostly cache hits when I let it grind on it for a long time”
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“I use the reasonix or whale harness for Deepseek, prefer the hyper optimized cache hits making request converge on almost free.”
Large contexts · 2
Cheap cached tokens make large-scale code analyses with mega context windows practical.
“I recommend their Reasonix harness strongly”
“I recommend their Reasonix harness strongly, due to its alignment to DeepSeek's prefix cache.”
Agent fleets · 1
One commenter runs many focused review and rule-enforcement agents that mostly share cache.
“And Reasonix + Deepseek is mostly cache hits when I let it grind on it for a long time”
Planning workflow · 1
Paired with planning-with-files, one commenter found it better than openspec.
“I use Reasonix with planning-with-files and that's been better than even openspec.”
Caveats and dissent
Data to China · 1
Using Reasonix requires sending data to China.
“I recommend their Reasonix harness strongly, due to its alignment to DeepSeek's prefix cache.”
Attentional drift · 2
Very large context runs come at the cost of some attentional drift.
“I recommend their Reasonix harness strongly”
“I recommend their Reasonix harness strongly, due to its alignment to DeepSeek's prefix cache.”
OpenRouter caching · 1
A commenter questioned whether cache benefits carry over when routing DeepSeek through OpenRouter.
“If I use Reasonix to talk to a deepseek endpoint through openrouter”
Often compared with
Who recommends it in their own words
Threads where it came up
- The current balance of power in open models 1 mention
- MiMo-v2.6-Pro: Intelligence, Performance and Price Analysis 1 mention
- We must pace the frontier 1 mention
- Qwen/Qwen3.8-2.4T-A95B 1 mention
- DeepSeek V4 Flash 0731 Intelligence, Performance and Price Analysis 1 mention
- Boris Cherny says "delete your Claude.md every 6 months" 1 mention
Also written as reasonix. Data: reasonix.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 14
“I recommend their Reasonix harness strongly”
“I recommend their Reasonix harness strongly, due to its alignment to DeepSeek's prefix cache.”
“DeepSeek via the Reasonix harness”
“I also like Reasonix quite a bit, as an agent harness”
“With reasonix or pi, I can code all day long and pay a few pennies for it.”
“And Reasonix + Deepseek is mostly cache hits when I let it grind on it for a long time”
“I use the reasonix or whale harness for Deepseek, prefer the hyper optimized cache hits making request converge on almost free.”
“When I want a harness to inhale a codebase and give me an answer, Reasonix has been the go-to for a while now, and it's great.”
“with Reasonix, DeepSeek is free real estate. Seems to just go and go for pennies.”
“especially with Reasonix agent (which maximizes caching, which DeepSeek is uniquely good at”
“I use Reasonix with planning-with-files and that's been better than even openspec.”
“Reasonix is an excellent CLI harness that is designed around maximizing cacheability of DeepSeek models”
“DeepSeek through OpenRouter and Reasonix”
“If I use Reasonix to talk to a deepseek endpoint through openrouter”