Open Sourced vs Closed Sourced
Opus 5 vs Kimi K3 vs GLM-5-3, with Gemini 3.7 as the souvenir model (check comments) all on max reasoning one-shot prompt: build a 3d steam engine working prototype using three.js Cost - output rates: Opus 5 $25/M, Kimi K3 $15/M, GLM-5-3
Claude Code team at Anthropic
"we removed over 80% of Claude Code's system prompt for models like Claude Opus 5 and Claude Fable 5 with no measurable loss on our coding evaluations" in this 60-second breakdown he explains why over-constraining the model with strict rules and
"Everyone doesn't need to be using Opus 5 or Fable 5.
It's like bringing a tank to a knife fight." -Affaf (Head of Eng, LaunchGood) on matching the model to the job as AI costs climb Full ep:
SITUATION EXPLAINED: Are companies rejecting frontier models, or are frontier models not good enough yet?
Fable 5 has plateaued at 11.4% of Anthropic dollar spend and just 6% of tokens, across 70,000 businesses tracked by Ramp • Opus 5 launched in late July at a lower price
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