DeepSeek V4 Flash
DeepSeek V4 Flash is DeepSeek's fast, lower-cost V4 model. On July 31, 2026, DeepSeek upgraded the `deepseek-v4-flash` API to the re-post-trained `DeepSeek-V4-Flash-0731` version in public beta, while keeping the request model ID unchanged and adding native Responses API and Codex support.
The update turns V4 Flash into DeepSeek's clearest coding-agent endpoint: it combines a 1M-token context window, 384K maximum output, tool calling, three practical reasoning effort levels, native Responses API support, 2,500-request account concurrency, and pricing far below the current V4 Pro endpoint.
DeepSeek's July 31 changelog confirms the public-beta API release, backend version, API-only scope, re-post-training, Codex adaptation, and vendor benchmark results. Current pricing and API references define the model ID, context, output limit, features, token prices, concurrency, stateless Responses behavior, and text-only input boundary. The official Hugging Face card still describes the downloadable V4 series as preview weights; Reddit is used only for questions about release status, vision, Flash-versus-Pro selection, and benchmark interpretation.
- Run cost-sensitive coding agents through the DeepSeek API.
- Connect Codex clients to a Responses-compatible DeepSeek endpoint.
- Build long-context text workflows with function calling or server-side web search.
- Compare Flash and the current V4 Pro preview endpoint on the same tasks, budget, and harness.
The request model remains `deepseek-v4-flash`, but DeepSeek now identifies the backend version as `DeepSeek-V4-Flash-0731`. The company says it keeps the preview model's architecture and size and changes only post-training. The release is an API update in public beta: V4 Pro and the DeepSeek App/Web models were not upgraded.
- Request model ID: `deepseek-v4-flash`.
- Current API version: `DeepSeek-V4-Flash-0731`.
- Release status: official API release in public beta, not an unconditional general-availability claim.
V4 Flash is currently the only DeepSeek model documented for the stateless `/responses` endpoint. It accepts text messages, reasoning items, function calls, function results, and server-side web-search calls, but not image or file inputs. DeepSeek also publishes a Codex provider configuration that uses `wire_api = "responses"` for Codex CLI, the desktop app, and the VS Code extension.
- Responses conversations are stateless, so clients resend the full conversation history.
- Reasoning effort maps to low, high, or max behavior; thinking is enabled by default.
- Function tools and server-side web search are supported; image and file inputs are not.
DeepSeek lists regular prices of $0.0028 per 1M cache-hit input tokens, $0.14 per 1M cache-miss input tokens, and $0.28 per 1M output tokens. The model has a 1M-token context window, 384K maximum output, and a 2,500 concurrent-request account limit. DeepSeek has announced a future peak/off-peak policy, but the effective date is still pending an official announcement.
DeepSeek reports large gains on agent benchmarks, including Terminal Bench 2.1, DeepSWE, Toolathlon verified, and internal DSBench sets. These are vendor-reported results, not independent proof. The public coding-agent runs used an unreleased DeepSeek Harness minimal mode with max effort, top-p 0.95, and temperature 1.0, while two DSBench sets are internal.
The larger V4 preview API endpoint, unchanged by the July 31 Flash release and still awaiting its official release.
A DeepSeek-native terminal coding agent designed around cache-aware API usage and model routing.
A frontier coding-model family relevant to agent performance, tool use, and provider-cost comparisons.
Source confidence
DeepSeek API Docs
DeepSeek API Docs
DeepSeek API Docs
DeepSeek API Docs
DeepSeek on Hugging Face
Reddit r/DeepSeek
DeepSeek V4 Flash FAQ
Common questions about DeepSeek V4 Flash.
Is DeepSeek V4 Flash generally available?+
Not as an unconditional GA release. DeepSeek calls July 31 the official V4 Flash API release, but the same announcement says it is in public beta. Use the stable `deepseek-v4-flash` request ID and keep the beta status in production risk reviews.
Does DeepSeek V4 Flash support the Responses API and Codex?+
Yes. V4 Flash is currently the only DeepSeek model documented for the native `/responses` endpoint, and DeepSeek publishes a Codex provider configuration for the CLI, desktop app, and VS Code extension. The endpoint is stateless, so the client must resend conversation history.
Did the July 31 release update the public DeepSeek V4 Flash weights?+
DeepSeek documents July 31 as an API-only update and says the 0731 model keeps the preview architecture and size with new post-training. The current official Hugging Face card still describes its downloadable V4 Flash weights as the preview release, so do not assume the API and local checkpoint are identical.
Is DeepSeek V4 Flash now better than V4 Pro?+
That is not established for every workload. DeepSeek reports much stronger agent benchmark scores for the updated Flash API, but the July 31 release did not update V4 Pro, some tests use an unreleased harness, and two DSBench sets are internal. Compare both endpoints on the same real tasks, tools, effort, latency, and budget.