DeepSeek V3 Base vs o3
DeepSeek V3 Base (2024) and o3 (2025) are frontier reasoning models from DeepSeek and OpenAI. DeepSeek V3 Base ships a 128k-token context window, while o3 ships a 200k-token context window. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads. It focuses on practical selection signals rather than broad model-family marketing.
o3 is safer overall; choose DeepSeek V3 Base when provider fit matters.
Decision scorecard
Local evidence first| Signal | DeepSeek V3 Base | o3 |
|---|---|---|
| Best for | general production evaluation | reasoning-heavy apps, multimodal apps, and tool-calling agents |
| Decision fit | Long context | Coding, RAG, and Agents |
| Context window | 128k | 200k |
| Cheapest output | - | $8/1M tokens |
| Provider routes | 0 tracked | 3 tracked |
| Shared benchmarks | 0 shared | 0 shared |
Decision tradeoffs
- Local decision data tags DeepSeek V3 Base for Long context.
- o3 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- o3 has broader tracked provider coverage for fallback and route flexibility.
- o3 uniquely exposes Vision, Multimodal, and Reasoning in local model data.
- Local decision data tags o3 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 Base
Unavailable
No complete token price in local provider data
o3
$3,600
Cheapest tracked route/tier: OpenAI API
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- No overlapping tracked provider route is sourced for DeepSeek V3 Base and o3; plan for SDK, billing, or endpoint changes.
- o3 adds Vision, Multimodal, and Reasoning in local capability data.
- No overlapping tracked provider route is sourced for o3 and DeepSeek V3 Base; plan for SDK, billing, or endpoint changes.
- Check replacement coverage for Vision, Multimodal, and Reasoning before moving production traffic.
Specs
| Specification | ||
|---|---|---|
| Released | 2024-12-26 | 2025-04-16 |
| Context window | 128k | 200k |
| Parameters | 671B total, 37B active (MoE) | — |
| Architecture | Mixture of Experts | Decoder Only |
| License | MITOSI-approved | Proprietary |
| Openness | Open source | Proprietary |
| Weights | Unknown | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: permitted | Commercial use: conditional |
| Knowledge cutoff | 2024-07 | 2024-06 |
Pricing and availability
| Pricing attribute | DeepSeek V3 Base | o3 |
|---|---|---|
| Input price | - | $2/1M tokens |
| Output price | - | $8/1M tokens |
| Providers | - |
Capabilities
| Capability | DeepSeek V3 Base | o3 |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | No | Yes |
| JSON / Tool use | No | Yes |
| Structured outputs | No | Yes |
| Code execution | No | Yes |
| 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.