Which AI Model Should Write Your Reddit Posts? We Tested 6 Combos
Reddit rewards value and bans self-promo. We built a flow that turns your content into community-ready posts in two stages — write, then fix for the rules — and benchmarked 6 model combos on quality, rule-compliance, and cost. Here is the scoreboard.
Reddit rewards genuine value and quietly buries self-promotion. We built one flow that turns your content library into community-ready posts in two stages — write, then fix for the rules — and benchmarked 6 model combos on post quality, rule-compliance, and cost. Every post was scored by a single Claude Opus 4.8 judge across 10 criteria. Here is the scoreboard:
| Writer → Fixer | Quality | Follows rules | $ / run |
|---|---|---|---|
| opus → gpt-5.4-mini ★ top quality |
97.3% |
95% |
$0.39 |
| opus → opus best rule-follower |
97.0% |
97% |
$0.50 |
| gpt-5.4-mini → gpt-5.4-mini ★ best value |
95.7% |
92% |
$0.02 |
| gpt-5.5 → gpt-5.5 | 94.9% |
93% |
$0.53 |
| gpt-5.4-mini → opus a strong fixer can't rescue a weak draft |
91.8% |
92% |
$0.14 |
| gemini-3.5-flash → gpt-5.5 would get you removed |
88.1% |
75% |
$0.20 |
“Quality” is the equal-weight average of 10 criteria; “Follows rules” is the community-compliance criterion (self-promo policy, subreddit rules). Same input posts, one Opus 4.8 judge. $ / run is the generate+fix cost for one batch, on 3 sample runs — treat the ranking, not the last decimal, as the signal.
Bottom line: ship gpt-5.4-mini for both stages — 95.7% quality at ~$0.02 a run. Reach for Opus 4.8 as the writer only when the last two points matter.
4 things we learned
The writer matters more than the fixer.
A strong writer + cheap fixer (opus→mini, 97.3%) beat a cheap writer + strong fixer (mini→opus, 91.8%). Spend on the first draft.
Cheap is almost as good, for 20× less.
gpt-5.4-mini on both stages landed 95.7% at ~$0.02 a run — within ~1.5 points of the best, at a fraction of the price.
A weak writer breaks the rules.
Gemini as the writer scored just 75% on community compliance — the kind of self-promo a mod removes. On Reddit, that is the score that gets you banned.
One judge, ten criteria, one pass.
Instead of ten separate calls, a single Opus 4.8 agent scores value, rules, originality, and 7 more per post — cheaper and more consistent than judging each in isolation.
How it works: write → fix → publish
- Write: turn each page into value-first drafts for the right subreddits, aware of what you have already posted.
- Fix: rewrite anything that trips a community rule — self-promo, off-topic, repeated mistakes — without losing the point.
- Judge: one Opus 4.8 pass scores every post on 10 criteria, so you can compare models instead of guessing.
Before and after: a post that would get removed
Before
“Check out Evaligo — the best AI workflow builder. Sign up at evaligo.com and automate everything!”
After (rule-compliant)
“We moved our content-to-Reddit pipeline onto a two-stage flow and cut posting time to minutes. Sharing the setup and what tripped the community rules along the way — happy to answer questions. (I work on the tool, so ask me anything about the trade-offs.)”
Leads with value, discloses the affiliation, drops the link-drop. That is the difference between a comment section and a removal.
The fine print
- Judge: Claude Opus 4.8, one combined agentic call per stage, scoring 10 criteria 0–1 (value, community compliance, originality, format, engagement, and more).
- Score: “Quality” is the equal-weight average of all 10; “Follows rules” is the community-compliance criterion alone.
- Sample: a small benchmark (3 runs per combo) — enough to rank, not to split hairs at the decimal.
Try it on your content
Build the same flow in Evaligo to turn your pages into community-ready Reddit posts — write, fix for the rules, and score every model combo before you commit. Then deploy it as an API and call it from your own pipeline.
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