MODEL PROFILE · DeepSeek
DeepSeek-V4.1-Flash
A multimodal API model with visual understanding. Read the current changelog before treating older V4 Pro migration notices as current routing policy.
Source reviewed: · Language model
Provider documentation summary. No hands-on results or independent ranking are claimed.
Documented facts
The following fields come from the official provider source, reviewed on the date above.
- Release date
- September 10, 2026, according to the API changelog.
- API name
- deepseek-flash selects V4.1-Flash in the reviewed documentation.
- Modality
- The provider documents native multimodal visual understanding. This is not a claim of image or video generation.
- Legacy Flash names
- The changelog says deepseek-v4-flash and deepseek-v4-flash-vision-exp temporarily route to V4.1-Flash.
- V4 Pro service
- The changelog says API service continues after September 14 with unchanged billing, pending further notice.
- Limits, license and rates
- Exact context/output limits, weight license and numeric prices were not verified for this profile. Check the linked official documentation before deployment.
Why the two official notices need to be read together
The launch page still describes a plan to route V4 Pro requests to V4.1-Flash from September 14 at 04:00 UTC until V4.1-Pro arrives. That announcement is not proof that this migration happened. The API changelog instead says V4 Pro service continues in response to user demand. The revision time of that continuation paragraph is not given. Both statements were visible when checked on September 28. Original launch notice.
Use the continuation notice for planning; verify execution separately
The operational changelog is the relevant correction to the older migration plan. It does not supply a V4.1-Pro release date. For an existing integration, verify the selected endpoint and actual response metadata before attributing an output to a model. DualView has not made API calls to test routing or account access. API changelog and continuation notice.
The practical decision
The immediate decision is whether to retain an existing Pro integration or evaluate Flash deliberately. Do not treat a legacy alias as an immutable version pin. Save the requested model name, returned metadata, request date, inputs and tool configuration together. If two runs use different underlying versions, a change in answer quality cannot be attributed only to the prompt. For a document-reading task, include visual material that matters to the answer and inspect whether the returned explanation actually uses it; this is a proposed evaluation, not a measured result.
What to record in your own comparison
- Separate the exact request identifier from the model identity documented at the time of the request. Retain response metadata without publishing secrets.
- Compare a fixed set of tasks and acceptance conditions. Record failures, corrections and total billed usage, not only the most attractive answer.
- Check live rates and relevant request limits before a migration. Do not copy V4 Pro prices or assume a compatibility alias keeps its previous behavior.
Limitations and unknowns
This profile reconciles public documentation; it does not independently verify backend routing, account entitlement, latency or model quality. Provider benchmark claims are not reproduced as DualView results. The launch page links deployment resources, but this review does not establish a weight license or hardware requirement. An unchanged source recheck is not a new model release.
Compare your saved results
Use the DualView editor to inspect files you already have. The accepted-output calculator uses your own rates and counts. Neither link runs a model or purchases generation.