DeepSeek V3.1 vs Gemini 2.5 Flash Live API
DeepSeek V3.1 (2025) and Gemini 2.5 Flash Live API (2025) are compact production models from DeepSeek and Google DeepMind. DeepSeek V3.1 ships a 64k-token context window, while Gemini 2.5 Flash Live API ships a 128k-token context window. On pricing, DeepSeek V3.1 costs $0.27/1M input tokens versus $0.50/1M 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 V3.1 is ~85% cheaper at $0.27/1M; pay for Gemini 2.5 Flash Live API only for long-context analysis.
Decision scorecard
Local evidence first| Signal | DeepSeek V3.1 | Gemini 2.5 Flash Live API |
|---|---|---|
| Best for | multimodal apps and provider-routed production | multimodal apps and tool-calling agents |
| Decision fit | Coding, Agents, and Vision | RAG, Agents, and Long context |
| Context window | 64k | 128k |
| Cheapest output | $1/1M tokens | $2/1M tokens |
| Provider routes | 8 tracked | 1 tracked |
| Shared benchmarks | 0 rows | 0 rows |
Decision tradeoffs
- DeepSeek V3.1 has the lower cheapest tracked output price at $1/1M tokens.
- DeepSeek V3.1 has broader tracked provider coverage for fallback and procurement flexibility.
- DeepSeek V3.1 uniquely exposes Structured outputs and Code execution in local model data.
- Local decision data tags DeepSeek V3.1 for Coding, Agents, and Vision.
- Gemini 2.5 Flash Live API has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Gemini 2.5 Flash Live API uniquely exposes Function calling and Tool use in local model data.
- Local decision data tags Gemini 2.5 Flash Live API for RAG, Agents, and Long context.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
DeepSeek V3.1
$466
Cheapest tracked route/tier: Novita AI
Gemini 2.5 Flash Live API
$900
Cheapest tracked route/tier: Google AI Studio
Estimated monthly gap: $434. 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 V3.1 and Gemini 2.5 Flash Live API; plan for SDK, billing, or endpoint changes.
- Gemini 2.5 Flash Live API is $1/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Structured outputs and Code execution before moving production traffic.
- Gemini 2.5 Flash Live API adds Function calling and Tool use in local capability data.
- No overlapping tracked provider route is sourced for Gemini 2.5 Flash Live API and DeepSeek V3.1; plan for SDK, billing, or endpoint changes.
- DeepSeek V3.1 is $1/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Function calling and Tool use before moving production traffic.
- DeepSeek V3.1 adds Structured outputs and Code execution in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2025-08-21 | 2025-12-01 |
| Context window | 64k | 128k |
| Parameters | 671B total, 37B active (MoE) | — |
| Architecture | mixture of experts | decoder only |
| License | MIT(OSI) | Proprietary |
| Openness | Open source | Proprietary |
| Commercial use | Commercial use allowed | Commercial use with conditions |
| Knowledge cutoff | - | 2025-01 |
Pricing and availability
| Pricing attribute | DeepSeek V3.1 | Gemini 2.5 Flash Live API |
|---|---|---|
| Input price | $0.27/1M tokens | $0.50/1M tokens |
| Output price | $1/1M tokens | $2/1M tokens |
| Providers |
Capabilities
| Capability | DeepSeek V3.1 | Gemini 2.5 Flash Live API |
|---|---|---|
| Vision | Yes | Yes |
| Multimodal | Yes | Yes |
| Reasoning | No | No |
| Function calling | No | Yes |
| Tool use | No | Yes |
| Structured outputs | Yes | No |
| Code execution | Yes | 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: Gemini 2.5 Flash Live API, tool use: Gemini 2.5 Flash Live API, structured outputs: DeepSeek V3.1, and code execution: DeepSeek V3.1. Both models share vision and multimodal input, 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 V3.1 lists $0.27/1M input and $1/1M output tokens on the cheapest tracked provider, while Gemini 2.5 Flash Live API lists $0.50/1M input and $2/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts DeepSeek V3.1 lower by about $0.46 per million blended tokens. Availability is 8 providers versus 1, so concentration risk also matters.
Choose DeepSeek V3.1 when coding workflow support, lower input-token cost, and broader provider choice are central to the workload. Choose Gemini 2.5 Flash Live API when long-context analysis and larger context windows are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, DeepSeek V3.1 or Gemini 2.5 Flash Live API?
Gemini 2.5 Flash Live API supports 128k tokens, while DeepSeek V3.1 supports 64k 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 V3.1 or Gemini 2.5 Flash Live API?
DeepSeek V3.1 is cheaper on tracked token pricing. DeepSeek V3.1 costs $0.27/1M input and $1/1M output tokens. Gemini 2.5 Flash Live API costs $0.50/1M input and $2/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is DeepSeek V3.1 or Gemini 2.5 Flash Live API open source?
DeepSeek V3.1 is listed under MIT. Gemini 2.5 Flash Live API 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, DeepSeek V3.1 or Gemini 2.5 Flash Live API?
Both DeepSeek V3.1 and Gemini 2.5 Flash Live API expose vision. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Which is better for multimodal input, DeepSeek V3.1 or Gemini 2.5 Flash Live API?
Both DeepSeek V3.1 and Gemini 2.5 Flash Live API expose multimodal input. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface.
Where can I run DeepSeek V3.1 and Gemini 2.5 Flash Live API?
DeepSeek V3.1 is available on Microsoft Foundry, Fireworks AI, NVIDIA NIM, Together AI, and AWS Bedrock. Gemini 2.5 Flash Live API is available on Google AI Studio. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-22. Data sourced from public model cards and provider documentation.