The shift highlights low stickiness in AI infrastructure markets.
Usage share of OpenAI grew vs Anthropic yesterday despite Mythos 5 / Fable 5 launch Multiple power users at SemiAnalysis tried Mythos / Fable Got refusals for nonsensical reasons Got pissed off at Anthropic Gave Codex a legitimate try Now they actually prefer it to 4.8 Opus
Positive users prefer OpenAI Codex over Anthropic Opus for its seamless non-second-guessing experience while negative users criticize Anthropic refusals as nonsensical workflow friction causing churn.
I will be honest:
1. Since Opus 4.7 I get pushback in unexpected ways from Anthropic models
2. GPT-5.5 doesn't do this
When I know what I want to do, I prefer #2. I don't like a vendor knowing better what I do, how I do it, with zero transparency. I humor Opus but like GPT...
Usage share of OpenAI grew vs Anthropic yesterday despite Mythos 5 / Fable 5 launch Multiple power users at SemiAnalysis tried Mythos / Fable Got refusals for nonsensical reasons Got pissed off at Anthropic Gave Codex a legitimate try Now they actually prefer it to 4.8 Opus
Is AI via API calls a good business with so little if any loyalty or stickiness?
Usage share of OpenAI grew vs Anthropic yesterday despite Mythos 5 / Fable 5 launch Multiple power users at SemiAnalysis tried Mythos / Fable Got refusals for nonsensical reasons Got pissed off at Anthropic Gave Codex a legitimate try Now they actually prefer it to 4.8 Opus
@VijarKohli Nah the model is materially worse still outside multi-modality
@dylan522p Cannot believe it took you guys so long to realize GPT-5.5 in codex is a better experience than Opus 4.8
@dylan522p No love for Gemini?
@dylan522p Codex is significantly better than CC
@dylan522p @zephyr_z9 Wait the split is this bad? Codex has been better for a while
@dylan522p @zephyr_z9 Bro just @ Dario at this point lmfao
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Usage share of OpenAI grew vs Anthropic yesterday despite Mythos 5 / Fable 5 launch Multiple power users at SemiAnalysis tried Mythos / Fable Got refusals for nonsensical reasons Got pissed off at Anthropic Gave Codex a legitimate try Now they actually prefer it to 4.8 Opus
@dylan522p we know who is most annoyed
@dylan522p 4.8 is kind of weird. 4.7 is better. 4.8 has been a complainer for me.
@dylan522p @zephyr_z9 • OpenAI deserves credit • Gemini should get recovery therapy • Anthropic needs to stop being misanthropic
@dylan522p This is what happens when refusals break workflows
frustration compounds and people actually try the alternative
@dylan522p Fable is objectively the best model, but GPT-5.5 is my fav as a daily driver. Opus and Sonnet aren't worth the cost. I'm very excited for the OpenAI release that is coming soon.
@dylan522p Anthropic still just dominates. I know gpt 5.5 is good. But my finance agent still uses opus 4.7... Why? I spent most of my time tuned the harness to fit Opus... But for long term, I will have to spend more time to tune GPT harness.
@dylan522p @zephyr_z9 I think I see a one pixel wide blue line at the top
@GergelyOrosz are you very sure you will be honest
@dylan522p Surprising to see no chinese cheap models? thought most of the commodity tasks were done by cheap models.
@dylan522p mandate can be lost faster than they think
@dylan522p @conorsen Hey where’s the blue line
The shift highlights low stickiness in AI infrastructure markets.
Usage share of OpenAI grew vs Anthropic yesterday despite Mythos 5 / Fable 5 launch Multiple power users at SemiAnalysis tried Mythos / Fable Got refusals for nonsensical reasons Got pissed off at Anthropic Gave Codex a legitimate try Now they actually prefer it to 4.8 Opus
