Claude Opus 4.8 vs Kimi K2.7-Code
Claude Opus 4.8 and Kimi K2.7-Code both target professional agentic coding workflows, but from opposite ends of the cost and openness spectrum. Opus 4.8 is Anthropic's top agentic-coding model with strong public benchmark coverage; Kimi K2.7-Code is Moonshot AI's open-weights coding specialist with a strong MCP JSON / Tool use claim at materially lower token prices.
Pick Claude Opus 4.8 when SWE-bench-verified agentic coding is the priority: it has public SWE-bench Pro, SWE-bench Verified, Terminal-Bench 2.1, and OSWorld rows, while Kimi K2.7-Code has no public SWE-bench or Terminal-Bench score. Pick Kimi K2.7-Code for MCP-first workflows, open-weight deployment, multimodal input, and lower-cost agent loops: Moonshot reports MCP Mark Verified at 81.1 versus Opus 4.8 at 76.4, and Kimi's direct route is $0.95/M input and $4/M output versus Opus at $5/M and $25/M.
Decision scorecard
Local evidence first| Signal | Claude Opus 4.8 | Kimi K2.7-Code |
|---|---|---|
| Product type | Standalone API model | Coding-specialized model |
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | custom coding agents, code generation, and tool loops |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 262k |
| Cheapest output | $25/1M tokens | $3.07/1M tokens |
| Provider routes | 6 tracked | 2 tracked |
| Shared benchmarks | CursorBench leader | 8 shared |
Decision tradeoffs
- Claude Opus 4.8 holds a shared-benchmark lead on CursorBench, ahead by 14.1 points.
- Claude Opus 4.8 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Opus 4.8 has broader tracked provider coverage for fallback and route flexibility.
- Claude Opus 4.8 uniquely exposes Code execution, Computer use, and Parallel agents in local model data.
- Local decision data tags Claude Opus 4.8 for Coding, RAG, and Agents.
- Kimi K2.7-Code has the lower cheapest tracked output price at $3.07/1M tokens.
- Local decision data tags Kimi K2.7-Code 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.
Claude Opus 4.8
$10,250
Cheapest tracked route/tier: Anthropic
Kimi K2.7-Code
$1,257
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $8,993. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Kimi K2.7-Code is $21.93/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Code execution, Computer use, and Parallel agents before moving production traffic.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Claude Opus 4.8 is $21.93/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Opus 4.8 adds Code execution, Computer use, and Parallel agents in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-05-28 | 2026-06-12 |
| Context window | 1m | 262k |
| Parameters | — | 1T |
| Architecture | Decoder Only | Mixture of Experts |
| License | Proprietary | MITOSI-approved |
| Openness | Proprietary | Open source |
| Weights | Not released | Available |
| Code | Not released | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: permitted |
| Knowledge cutoff | 2026-01 | - |
Pricing and availability
| Pricing attribute | Claude Opus 4.8 | Kimi K2.7-Code |
|---|---|---|
| Input price | $5/1M tokens | $0.61/1M tokens |
| Output price | $25/1M tokens | $3.07/1M tokens |
| Providers |
Capabilities
| Capability | Claude Opus 4.8 | Kimi K2.7-Code |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | Yes | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | Yes | No |
| IDE integration | No | No |
| Computer use | Yes | No |
| Parallel agents | Yes | No |
Benchmarks
| Benchmark | Claude Opus 4.8 | Kimi K2.7-Code |
|---|---|---|
| CursorBench | 63.8 | 49.7 |
| GeneBench-Pro | 16.0 | 2.3 |
| CursorBench | 62.3 | 49.7 |
| CursorBench | 59.4 | 49.7 |
| CursorBench | 58.0 | 49.7 |
| CursorBench | 56.1 | 49.7 |
| MCP-Atlas | 82.2 | 76.0 |
| CursorBench | 53.1 | 49.7 |
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Last reviewed: 2026-07-26. Data sourced from public model cards and provider documentation.