DeepSeek V3 vs Step 3.7 Flash
DeepSeek V3 (2024) and Step 3.7 Flash (2026) are frontier reasoning models from DeepSeek and StepFun. DeepSeek V3 ships a 64k-token context window, while Step 3.7 Flash ships a 256k-token context window. On pricing, DeepSeek V3 costs $0.10/1M input tokens versus $0.20/1M 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.
DeepSeek V3 is ~100% cheaper at $0.10/1M; pay for Step 3.7 Flash only for reasoning depth.
Decision scorecard
Local evidence first| Signal | DeepSeek V3 | Step 3.7 Flash |
|---|---|---|
| Best for | tool-calling agents and provider-routed production | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Coding, Agents, and Classification | Coding, RAG, and Agents |
| Context window | 64k | 256k |
| Cheapest output | $0.30/1M tokens | $1.15/1M tokens |
| Provider routes | 13 tracked | 3 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- DeepSeek V3 has the lower cheapest tracked output price at $0.30/1M tokens.
- DeepSeek V3 has broader tracked provider coverage for fallback and route flexibility.
- Local decision data tags DeepSeek V3 for Coding, Agents, and Classification.
- Step 3.7 Flash has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Step 3.7 Flash uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags Step 3.7 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 V3
$155
Cheapest tracked route/tier: Bitdeer AI
Step 3.7 Flash
$448
Cheapest tracked route/tier: StepFun
Estimated monthly gap: $293. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and NVIDIA NIM; start route-level A/B tests there.
- Step 3.7 Flash is $0.85/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Step 3.7 Flash adds Vision, Multimodal, and Reasoning in local capability data.
- Provider overlap exists on OpenRouter and NVIDIA NIM; start route-level A/B tests there.
- DeepSeek V3 is $0.85/1M 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.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-12-26 | 2026-05-29 |
| Context window | 64k | 256k |
| Parameters | 671B | 198B (11B active) |
| Architecture | Mixture of Experts | Mixture of Experts |
| License | MITOSI-approved | Proprietary |
| Openness | Open source | Proprietary |
| Weights | Available | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: permitted | Commercial use: conditional |
| Knowledge cutoff | 2024-04 | - |
Pricing and availability
| Pricing attribute | DeepSeek V3 | Step 3.7 Flash |
|---|---|---|
| Input price | $0.10/1M tokens | $0.20/1M tokens |
| Output price | $0.30/1M tokens | $1.15/1M tokens |
| Providers |
Capabilities
| Capability | DeepSeek V3 | Step 3.7 Flash |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | Yes |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
No shared benchmark scores are currently available for this pair.
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.