Kimi K3 Matches Opus 5 Quality at Lower Cost
Fireworks AI benchmark compares Kimi K3 and Opus 5 on SWE and coding tasks using task-based pricing.
TLDR
Lin Qiao, CEO of Fireworks AI, posted results from internal benchmarks pitting Moonshot AI's Kimi K3 against Anthropic's Opus 5. Task-level quality was close across SWE, algorithmic, and terminal workloads, with Opus 5 on par or slightly ahead in some cases. Kimi K3 delivered the same work at 2x to 4.6x lower per-task cost under serverless pricing. A separate Julius harness test on a Minecraft task produced similar cost and speed advantages for Kimi K3. The comparison highlights open-model verbosity and the shift toward task-based rather than token-based evaluation.
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