DeepSeek R1 Basic vs DeepSeek V4 Flash
DeepSeek R1 Basic (2025) and DeepSeek V4 Flash (2026) are frontier-tier reasoning models from DeepSeek. DeepSeek R1 Basic ships a 160k-token context window, while DeepSeek V4 Flash ships a 1m-token context window. On pricing, DeepSeek V4 Flash costs $0.11/1M input tokens versus $0.56/1M 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.
DeepSeek V4 Flash is ~400% cheaper at $0.11/1M; pay for DeepSeek R1 Basic only for provider fit.
Decision scorecard
Local evidence first| Signal | DeepSeek R1 Basic | DeepSeek V4 Flash |
|---|---|---|
| Best for | reasoning-heavy apps | reasoning-heavy apps, tool-calling agents, and long-context analysis |
| Decision fit | Long context | Coding, RAG, and Agents |
| Context window | 160k | 1m |
| Cheapest output | $1.68/1M tokens | $0.22/1M tokens |
| Provider routes | 1 tracked | 5 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- Local decision data tags DeepSeek R1 Basic for Long context.
- DeepSeek V4 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
- DeepSeek V4 Flash has the lower cheapest tracked output price at $0.22/1M tokens.
- DeepSeek V4 Flash has broader tracked provider coverage for fallback and procurement flexibility.
- DeepSeek V4 Flash uniquely exposes Function calling, Tool use, and Structured outputs in local model data.
- Local decision data tags DeepSeek V4 Flash 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
DeepSeek V4 Flash
$146
Cheapest tracked route/tier: OpenRouter
Estimated monthly gap: $722. 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 DeepSeek V4 Flash; plan for SDK, billing, or endpoint changes.
- DeepSeek V4 Flash is $1.46/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- DeepSeek V4 Flash adds Function calling, Tool use, and Structured outputs in local capability data.
- No overlapping tracked provider route is sourced for DeepSeek V4 Flash and DeepSeek R1 Basic; plan for SDK, billing, or endpoint changes.
- DeepSeek R1 Basic is $1.46/1M 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 | 2026-04-24 |
| Context window | 160k | 1m |
| Parameters | 671B | 284B |
| Architecture | decoder only | mixture of experts |
| License | Open Source | MIT |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | DeepSeek R1 Basic | DeepSeek V4 Flash |
|---|---|---|
| Input price | $0.56/1M tokens | $0.11/1M tokens |
| Output price | $1.68/1M tokens | $0.22/1M tokens |
| Providers |
Capabilities
| Capability | DeepSeek R1 Basic | DeepSeek V4 Flash |
|---|---|---|
| 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: DeepSeek V4 Flash, tool use: DeepSeek V4 Flash, and structured outputs: DeepSeek V4 Flash. 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 DeepSeek V4 Flash lists $0.11/1M input and $0.22/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts DeepSeek V4 Flash lower by about $0.75 per million blended tokens. Availability is 1 providers versus 5, so concentration risk also matters.
Choose DeepSeek R1 Basic when provider fit are central to the workload. Choose DeepSeek V4 Flash 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 DeepSeek V4 Flash?
DeepSeek V4 Flash supports 1m 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 DeepSeek V4 Flash?
DeepSeek V4 Flash is cheaper on tracked token pricing. DeepSeek R1 Basic costs $0.56/1M input and $1.68/1M output tokens. DeepSeek V4 Flash costs $0.11/1M input and $0.22/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is DeepSeek R1 Basic or DeepSeek V4 Flash open source?
DeepSeek R1 Basic is listed under Open Source. DeepSeek V4 Flash is listed under MIT. 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 DeepSeek V4 Flash?
Both DeepSeek R1 Basic and DeepSeek V4 Flash expose reasoning mode. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for function calling, DeepSeek R1 Basic or DeepSeek V4 Flash?
DeepSeek V4 Flash 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 DeepSeek V4 Flash?
DeepSeek R1 Basic is available on Fireworks AI. DeepSeek V4 Flash is available on DeepSeek Platform, OpenRouter, Microsoft Foundry, Vercel AI Gateway, and Novita AI. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-25. Data sourced from public model cards and provider documentation.