Kimi K2 Thinking vs o3
Kimi K2 Thinking (2025) and o3 (2025) are frontier-tier reasoning models from Moonshot AI and OpenAI. Kimi K2 Thinking ships a 256k-token context window, while o3 ships a 200k-token context window. On pricing, Kimi K2 Thinking costs $0.60/1M input tokens versus $2/1M for the alternative. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Kimi K2 Thinking is ~233% cheaper at $0.60/1M; pay for o3 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Kimi K2 Thinking | o3 |
|---|---|---|
| Best for | reasoning-heavy apps and provider-routed production | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | RAG, Long context, and Classification | Coding, RAG, and Agents |
| Context window | 256k | 200k |
| Cheapest output | $2.50/1M tokens | $8/1M tokens |
| Provider routes | 7 tracked | 3 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Kimi K2 Thinking has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Kimi K2 Thinking has the lower cheapest tracked output price at $2.50/1M tokens.
- Kimi K2 Thinking has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags Kimi K2 Thinking for RAG, Long context, and Classification.
- o3 uniquely exposes Vision, Multimodal, and JSON / Tool use in local model data.
- Local decision data tags o3 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Kimi K2 Thinking
$1,105
Cheapest tracked route/tier: Fireworks AI
o3
$3,600
Cheapest tracked route/tier: OpenAI API
Estimated monthly gap: $2,495. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- o3 is $5.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- o3 adds Vision, Multimodal, and JSON / Tool use in local capability data.
- Provider overlap exists on OpenRouter and Vercel AI Gateway; start route-level A/B tests there.
- Kimi K2 Thinking is $5.50/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and JSON / Tool use before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-01-01 | 2025-04-16 |
| Context window | 256k | 200k |
| Parameters | 1T (32B active) | — |
| Architecture | Decoder Only | Decoder Only |
| License | MITOSI-approved | Proprietary |
| Openness | Open source | Proprietary |
| Weights | Unknown | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: permitted | Commercial use: conditional |
| Knowledge cutoff | - | 2024-06 |
Pricing and availability
| Pricing attribute | Kimi K2 Thinking | o3 |
|---|---|---|
| Input price | $0.60/1M tokens | $2/1M tokens |
| Output price | $2.50/1M tokens | $8/1M tokens |
| Providers |
Capabilities
| Capability | Kimi K2 Thinking | o3 |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | Yes | Yes |
| JSON / Tool use | No | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.