DeepSeek R1 Basic vs Qwen3.5-35B-A3B
DeepSeek R1 Basic (2025) and Qwen3.5-35B-A3B (2026) are frontier-tier reasoning models from DeepSeek and Alibaba. DeepSeek R1 Basic ships a 160k-token context window, while Qwen3.5-35B-A3B ships a 262k-token context window. On pricing, Qwen3.5-35B-A3B costs $0.14/1M input tokens versus $0.56/1M 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.
Qwen3.5-35B-A3B is ~303% cheaper at $0.14/1M; pay for DeepSeek R1 Basic only for provider fit.
Decision scorecard
Local evidence first| Signal | DeepSeek R1 Basic | Qwen3.5-35B-A3B |
|---|---|---|
| Best for | reasoning-heavy apps | reasoning-heavy apps, tool-calling agents, and provider-routed production |
| Decision fit | Long context | Coding, RAG, and Agents |
| Context window | 160k | 262k |
| Cheapest output | $1.68/1M tokens | $1/1M tokens |
| Provider routes | 1 tracked | 2 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Local decision data tags DeepSeek R1 Basic for Long context.
- Qwen3.5-35B-A3B has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Qwen3.5-35B-A3B has the lower cheapest tracked output price at $1/1M tokens.
- Qwen3.5-35B-A3B has broader tracked provider coverage for fallback and procurement flexibility.
- Qwen3.5-35B-A3B uniquely exposes Function calling, Tool use, and Structured outputs in local model data.
- Local decision data tags Qwen3.5-35B-A3B 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.
DeepSeek R1 Basic
$868
Cheapest tracked route/tier: Fireworks AI
Qwen3.5-35B-A3B
$361
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $507. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- No overlapping tracked provider route is sourced for DeepSeek R1 Basic and Qwen3.5-35B-A3B; plan for SDK, billing, or endpoint changes.
- Qwen3.5-35B-A3B is $0.68/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Qwen3.5-35B-A3B adds Function calling, Tool use, and Structured outputs in local capability data.
- No overlapping tracked provider route is sourced for Qwen3.5-35B-A3B and DeepSeek R1 Basic; plan for SDK, billing, or endpoint changes.
- DeepSeek R1 Basic is $0.68/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Function calling, Tool use, and Structured outputs before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-01-01 | 2026-02-24 |
| Context window | 160k | 262k |
| Parameters | 671B | 35B |
| Architecture | decoder only | mixture of experts |
| License | MIT(OSI) | Apache 2.0(OSI) |
| Openness | Open source | Open source |
| Commercial use | Commercial use allowed | Commercial use allowed |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | DeepSeek R1 Basic | Qwen3.5-35B-A3B |
|---|---|---|
| Input price | $0.56/1M tokens | $0.14/1M tokens |
| Output price | $1.68/1M tokens | $1/1M tokens |
| Providers |
Capabilities
| Capability | DeepSeek R1 Basic | Qwen3.5-35B-A3B |
|---|---|---|
| Vision | No | No |
| Multimodal | No | No |
| Reasoning | Yes | Yes |
| Function calling | No | Yes |
| Tool use | No | Yes |
| Structured outputs | No | Yes |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark rows are currently sourced for this pair.
Deep dive
The capability footprint differs most on function calling: Qwen3.5-35B-A3B, tool use: Qwen3.5-35B-A3B, and structured outputs: Qwen3.5-35B-A3B. Both models share reasoning mode, 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, DeepSeek R1 Basic lists $0.56/1M input and $1.68/1M output tokens on the cheapest tracked provider, while Qwen3.5-35B-A3B lists $0.14/1M input and $1/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts Qwen3.5-35B-A3B lower by about $0.50 per million blended tokens. Availability is 1 providers versus 2, so concentration risk also matters.
Choose DeepSeek R1 Basic when provider fit are central to the workload. Choose Qwen3.5-35B-A3B when long-context analysis, larger context windows, 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. It also helps separate model capability from provider packaging, which can change cost and latency.
FAQ
Which has a larger context window, DeepSeek R1 Basic or Qwen3.5-35B-A3B?
Qwen3.5-35B-A3B supports 262k tokens, while DeepSeek R1 Basic supports 160k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, DeepSeek R1 Basic or Qwen3.5-35B-A3B?
Qwen3.5-35B-A3B is cheaper on tracked token pricing. DeepSeek R1 Basic costs $0.56/1M input and $1.68/1M output tokens. Qwen3.5-35B-A3B costs $0.14/1M input and $1/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is DeepSeek R1 Basic or Qwen3.5-35B-A3B open source?
DeepSeek R1 Basic is listed under MIT. Qwen3.5-35B-A3B is listed under Apache 2.0. 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 reasoning mode, DeepSeek R1 Basic or Qwen3.5-35B-A3B?
Both DeepSeek R1 Basic and Qwen3.5-35B-A3B expose reasoning mode. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Which is better for function calling, DeepSeek R1 Basic or Qwen3.5-35B-A3B?
Qwen3.5-35B-A3B has the clearer documented function calling signal in this comparison. If function calling is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run DeepSeek R1 Basic and Qwen3.5-35B-A3B?
DeepSeek R1 Basic is available on Fireworks AI. Qwen3.5-35B-A3B is available on OpenRouter and Novita AI. Provider coverage can affect latency, region availability, compliance posture, and fallback options. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Continue comparing
Last reviewed: 2026-05-22. Data sourced from public model cards and provider documentation.