Kimi K3
Moonshot AI's 2.8-trillion-parameter flagship — the world's first open 3T-class model. Built for sustained, multi-step coding and agent workflows with a 1M token context window and native multimodal input.
Best for
Long-horizon coding sessions, frontend/UI generation, multi-step agent workflows, large codebase analysis
Strengths
2.8T parameters (MoE, 16/896 experts active per token)
#1 on Frontend Code Arena (blind human evaluation)
Excels at sustained multi-step engineering tasks
Native vision — debug UI against screenshots
1M token context with flat pricing, no long-context surcharge
Always-on chain-of-thought reasoning
When to use
Choose Kimi K3 when you need sustained focus across large codebases, multi-file refactoring, frontend code generation, or agent workflows that require many sequential tool calls. Particularly strong when the task demands endurance over multiple iterations rather than a single-shot answer.
Limitations
Always-on reasoning means every response includes a thinking trace (billed as output tokens), making simple queries more expensive than lightweight models. No non-thinking mode available yet.
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