Composer 2.5 vs Grok 4 Heavy
Composer 2.5 (2026) and Grok 4 Heavy (2025) compare an IDE-native agent built on Kimi K2.5 against a standalone API model. Composer 2.5 ships a 1m-token context window, while Grok 4 Heavy ships a 256k-token context window. This page treats the result as workflow and deployment fit, not a universal model winner.
Use Composer 2.5 when you want the packaged IDE-native agent built on Kimi K2.5 workflow; use Grok 4 Heavy when you need a model you can route, wrap, or run outside that product surface.
Decision scorecard
Local evidence first| Signal | Composer 2.5 | Grok 4 Heavy |
|---|---|---|
| Product type | IDE-native agent built on Kimi K2.5 | Standalone API model |
| Best for | Long Cursor IDE sessions and autonomous in-IDE coding | API builders, multimodal apps, and non-IDE automation |
| Decision fit | Coding, RAG, and Agents | Coding, Long context, and Vision |
| Context window | 1m | 256k |
| Cheapest output | $2.50/1M tokens | - |
| Provider routes | 1 tracked | 0 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Composer 2.5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Composer 2.5 has broader tracked provider coverage for fallback and route flexibility.
- Composer 2.5 uniquely exposes JSON / Tool use, Code execution, and IDE integration in local model data.
- Local decision data tags Composer 2.5 for Coding, RAG, and Agents.
- Grok 4 Heavy uniquely exposes Vision and Multimodal in local model data.
- Local decision data tags Grok 4 Heavy for Coding, Long context, and Vision.
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
Grok 4 Heavy
Unavailable
No complete token price in local provider data
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for Composer 2.5 and Grok 4 Heavy; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for JSON / Tool use, Code execution, and IDE integration before moving production traffic.
- Grok 4 Heavy adds Vision and Multimodal in local capability data.
- No overlapping tracked provider route is sourced for Grok 4 Heavy and Composer 2.5; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision and Multimodal before moving production traffic.
- Composer 2.5 adds JSON / Tool use, Code execution, and IDE integration in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-05-18 | 2025-07-09 |
| Context window | 1m | 256k |
| Parameters | — | — |
| Architecture | - | - |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Weights | Not released | Not released |
| Code | Not released | Unknown |
| Commercial use | Commercial use: conditional | Commercial use: conditional |
| Knowledge cutoff | - | 2024-11 |
Pricing and availability
| Pricing attribute | Composer 2.5 | Grok 4 Heavy |
|---|---|---|
| Input price |
| - |
| Output price |
| - |
| Providers | - |
Capabilities
| Capability | Composer 2.5 | Grok 4 Heavy |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | No |
| JSON / Tool use | Yes | No |
| Structured outputs | No | No |
| Code execution | Yes | No |
| IDE integration | Yes | No |
| Computer use | No | No |
| Parallel agents | Yes | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
Continue comparing
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Last reviewed: 2026-07-09. Data sourced from public model cards and provider documentation.