Opus 5.5 gave us 50% savings, with 2x the speed of Opus 5.
DeepSeek Flash v4.1 is now 22x cheaper & 30% faster than Opus 5.5. Same performance.
DeepSeek caveats:
+ You have an LLM-Agent-UMF architecture. Vanilla pi harness fails.
+ Coding tasks are lousy. Beyond coding, difficult open-ended reasoning scenarios are the ones at which it performs best for us.
DeepSeek caveats: + You have an LLM-Agent-UMF architecture. Vanilla pi harness fails. + Coding tasks are lousy. Beyond coding, difficult open-ended reasoning scenarios are the ones at which it performs best for us.