Fireworks says Kimi K3 matches Opus 5 quality at 2x–4.6x lower task cost
lqiao · x · 2026-07-28
Kimi K3 matches Opus 5 on task quality while costing 2x–4.6x less per task
Fireworks shared a benchmark comparison between Kimi K3 and Opus 5 across three common workloads: SWE, algorithmic tasks, and terminal tasks.
Key takeaways from their study:
- They measure task-level cost, not token-level cost, arguing that token pricing misses verbosity differences between open and closed models.
- Across the evaluated workloads, overall quality is described as very close.
- Kimi K3 is reported to be 2x to 4.6x cheaper per task on serverless pricing, depending on the task.
- Fireworks says it will keep improving both serving efficiency and training quality.
Related event: Fireworks Test: Kimi K3 Matches Opus 5 Quality at Fraction of Cost(5 posts)→
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