Composer 2.5 vs Kimi K2.6
Composer 2.5 and Kimi K2.6 are closely related but not equivalent. Cursor says Composer 2.5 is built on Moonshot's Kimi K2.5 checkpoint; Kimi K2.6 is the successor generation with open-weight/API availability, multimodal input, and broader benchmark coverage.
Pick Composer 2.5 for Cursor-native IDE work and Cursor's agent harness. Pick Kimi K2.6 for API access, open-weight/self-hosting evaluation, multimodal workflows, and broader standalone benchmark coverage. The key caveat is lineage: Composer 2.5 is a Cursor fine-tune of Kimi K2.5, while K2.6 is the next Kimi generation, not Composer's base model.
Decision scorecard
Local evidence first| Signal | Composer 2.5 | Kimi K2.6 |
|---|---|---|
| Product type | IDE-native agent built on Kimi K2.5 | Coding-specialized model |
| Best for | Long Cursor IDE sessions and autonomous in-IDE coding | custom coding agents, code generation, and tool loops |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 262k |
| Cheapest output | $2.50/1M tokens | $3.49/1M tokens |
| Provider routes | 1 tracked | 9 tracked |
| Shared benchmarks | SWE-bench Multilingual leader | 2 shared |
Decision tradeoffs
- Composer 2.5 holds a shared-benchmark lead on SWE-bench Multilingual, ahead by 3.1 points.
- Composer 2.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Composer 2.5 has the lower cheapest tracked output price at $2.50/1M tokens.
- Composer 2.5 uniquely exposes Code execution, IDE integration, and Parallel agents in local model data.
- Local decision data tags Composer 2.5 for Coding, RAG, and Agents.
- Kimi K2.6 has broader tracked provider coverage for fallback and procurement flexibility.
- Kimi K2.6 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Kimi K2.6 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.
Composer 2.5
$1,025
Cheapest tracked route/tier: Cursor Standard async
Kimi K2.6
$1,457
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $432. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Composer 2.5 and Kimi K2.6; plan for SDK, billing, or endpoint changes.
- Kimi K2.6 is $0.99/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Code execution, IDE integration, and Parallel agents before moving production traffic.
- Kimi K2.6 adds Vision, Multimodal, and Reasoning in local capability data.
- No overlapping tracked provider route is sourced for Kimi K2.6 and Composer 2.5; plan for SDK, billing, or endpoint changes.
- Composer 2.5 is $0.99/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
- Composer 2.5 adds Code execution, IDE integration, and Parallel agents in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-05-18 | 2026-04-20 |
| Context window | 1m | 262k |
| Parameters | — | 1T |
| Architecture | - | Mixture of Experts |
| License | Proprietary | MIT(OSI) |
| Openness | Proprietary | Open source |
| Commercial use | Commercial use with conditions | Commercial use allowed |
| Knowledge cutoff | - | 2025-04 |
Pricing and availability
| Pricing attribute | Composer 2.5 | Kimi K2.6 |
|---|---|---|
| Input price |
| $0.73/1M tokens |
| Output price |
| $3.49/1M tokens |
| Providers |
Capabilities
| Capability | Composer 2.5 | Kimi K2.6 |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | No | Yes |
| Code execution | Yes | No |
| IDE integration | Yes | No |
| Computer use | No | No |
| Parallel agents | Yes | No |
Benchmarks
| Benchmark | Composer 2.5 | Kimi K2.6 |
|---|---|---|
| SWE-bench Multilingual | 79.8 | 76.7 |
| Terminal-Bench 2.0 | 69.3 | 66.7 |
Harness caveat. Composer 2.5 is measured as IDE-native agent built on Kimi K2.5, while Kimi K2.6 is coding-specialized model. Treat shared benchmark scores as directional because IDE or product scaffolding, tool access, prompt routing, and interaction mode can change real application results.
Deep dive
The lineage caveat should be visible before the table. Cursor's Composer 2.5 launch says it is built on the same open-source checkpoint as Composer 2, Moonshot's Kimi K2.5. Kimi K2.6 is the successor to that base family, so this is partly a comparison between a Cursor fine-tuned IDE agent and the next upstream Kimi model generation.
Kimi K2.6 has the stronger standalone model surface. It has tracked API/provider routes, open-weight positioning, 262K context, multimodal input, and seed rows for SWE-Bench Verified, LiveCodeBench, GPQA, SWE-Bench Pro, and Terminal-Bench. Composer 2.5 is product-bound to Cursor and should be read through that workflow lens.
Composer remains the better Cursor-specific choice. It is optimized for IDE sessions, uses Cursor's compaction-in-the-loop context management, and has CursorBench plus Terminal-Bench rows from a Cursor agent context. If a team already works in Cursor and does not need external API access, Composer is the natural first experiment.
The benchmark comparison is mixed and caveated. Kimi K2.6 has the published SWE-Bench Verified row; Composer does not. Composer has a small Terminal-Bench 2.0 edge in the current seed rows, but those scores come from product and secondary contexts. Kimi leads on broader standalone coding and reasoning coverage.
Cost is close at Composer standard versus Kimi direct routes, but deployment changes the decision. Composer standard is $0.50/M input and $2.50/M output inside Cursor. Kimi routes vary by provider and can be used outside Cursor, which matters when a model needs to power an app, agent service, or self-hosted evaluation.
FAQ
Is Composer 2.5 based on Kimi K2.6?
No. Cursor says Composer 2.5 is built on Moonshot's Kimi K2.5 checkpoint. Kimi K2.6 is the successor to K2.5, so it is related by family lineage but is not Composer 2.5's base model.
Which has better standalone benchmark coverage?
Kimi K2.6 has broader standalone benchmark coverage in the seed, including SWE-Bench Verified, LiveCodeBench, GPQA, SWE-Bench Pro, and Terminal-Bench rows. Composer 2.5's benchmark evidence is narrower and tied to Cursor's product harness.
Which should I use inside Cursor?
Composer 2.5 is the first choice inside Cursor because it is Cursor-native and tuned for that IDE workflow. Kimi K2.6 is more useful when you need API access, open-weight evaluation, multimodal input, or a model outside Cursor.
Is Kimi K2.6 open source while Composer 2.5 is proprietary?
The current seed tracks Kimi K2.6 as open weights and available through multiple provider routes, while Composer 2.5 is proprietary and Cursor-exclusive. Confirm license thresholds before commercial self-hosting or redistribution.
Continue comparing
Last reviewed: 2026-06-15. Data sourced from public model cards and provider documentation.