Claude Sonnet 4.6 vs Composer 2.5
Claude Sonnet 4.6 (2026) and Composer 2.5 (2026) are agentic coding models from Anthropic and Cursor (Anysphere). Claude Sonnet 4.6 ships a 1M-token context window, while Composer 2.5 ships a not-yet-sourced context window. On pricing, Composer 2.5 costs $0.5/1M input tokens versus $3/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit. It focuses on practical selection signals rather than broad model-family marketing.
Composer 2.5 is ~500% cheaper at $0.5/1M; pay for Claude Sonnet 4.6 only for coding workflow support.
Decision scorecard
Local evidence first| Signal | Claude Sonnet 4.6 | Composer 2.5 |
|---|---|---|
| Decision fit | Coding, RAG, and Agents | Coding, Agents, and JSON / Tool use |
| Context window | 1M | — |
| Cheapest output | $15/1M tokens | $2.5/1M tokens |
| Provider routes | 5 tracked | 1 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Claude Sonnet 4.6 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Sonnet 4.6 has broader tracked provider coverage for fallback and procurement flexibility.
- Claude Sonnet 4.6 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Claude Sonnet 4.6 for Coding, RAG, and Agents.
- Composer 2.5 has the lower cheapest tracked output price at $2.5/1M tokens.
- Local decision data tags Composer 2.5 for Coding, Agents, and JSON / Tool use.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
Claude Sonnet 4.6
$6,150
Cheapest tracked route: OpenRouter
Composer 2.5
$1,025
Cheapest tracked route: Cursor
Estimated monthly gap: $5,125. Batch, cache, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for Claude Sonnet 4.6 and Composer 2.5; plan for SDK, billing, or endpoint changes.
- Composer 2.5 is $12.50/1M 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.
- No overlapping tracked provider route is sourced for Composer 2.5 and Claude Sonnet 4.6; plan for SDK, billing, or endpoint changes.
- Claude Sonnet 4.6 is $12.50/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Claude Sonnet 4.6 adds Vision, Multimodal, and Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-02-17 | 2026-05-18 |
| Context window | 1M | — |
| Parameters | — | — |
| Architecture | decoder only | - |
| License | Proprietary | Proprietary |
| Knowledge cutoff | 2025-12 | - |
Pricing and availability
| Pricing attribute | Claude Sonnet 4.6 | Composer 2.5 |
|---|---|---|
| Input price | $3/1M tokens | $0.5/1M tokens |
| Output price | $15/1M tokens | $2.5/1M tokens |
| Providers |
Capabilities
| Capability | Claude Sonnet 4.6 | Composer 2.5 |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | No |
| Code execution | Yes | Yes |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on vision: Claude Sonnet 4.6, multimodal input: Claude Sonnet 4.6, reasoning mode: Claude Sonnet 4.6, and structured outputs: Claude Sonnet 4.6. Both models share function calling, tool use, and code execution, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, Claude Sonnet 4.6 lists $3/1M input and $15/1M output tokens, while Composer 2.5 lists $0.5/1M input and $2.5/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Composer 2.5 lower by about $5.5 per million blended tokens. Availability is 5 providers versus 1, so concentration risk also matters.
Choose Claude Sonnet 4.6 when coding workflow support and broader provider choice are central to the workload. Choose Composer 2.5 when coding workflow support and lower input-token cost are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship. This keeps the decision grounded in measurable tradeoffs instead of brand-level assumptions.
FAQ
Which is cheaper, Claude Sonnet 4.6 or Composer 2.5?
Composer 2.5 is cheaper on tracked token pricing. Claude Sonnet 4.6 costs $3/1M input and $15/1M output tokens. Composer 2.5 costs $0.5/1M input and $2.5/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is Claude Sonnet 4.6 or Composer 2.5 open source?
Claude Sonnet 4.6 is listed under Proprietary. Composer 2.5 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Sonnet 4.6 or Composer 2.5?
Claude Sonnet 4.6 has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Claude Sonnet 4.6 or Composer 2.5?
Claude Sonnet 4.6 has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for reasoning mode, Claude Sonnet 4.6 or Composer 2.5?
Claude Sonnet 4.6 has the clearer documented reasoning mode signal in this comparison. If reasoning mode is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run Claude Sonnet 4.6 and Composer 2.5?
Claude Sonnet 4.6 is available on OpenRouter, Anthropic, AWS Bedrock, GCP Vertex AI, and Microsoft Foundry. Composer 2.5 is available on Cursor. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-05-19. Data sourced from public model cards and provider documentation.