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DeepSeek

DeepSeek V4.1 Flash

One model name, two snapshots (0910, 1017): the API name stayed deepseek-flash. Scores use the current snapshot's evidence only.

Snapshots: 0910 Sep 10 → 1017 Oct 17 · current

FTI
32

3 sources, 3 independent of the vendor: centre 32.

how FTI is computed

#3 of 72 with an FTI score
Context1Mtokens
Imagesyesimage input
Free now2 of 3channels
Tested by us2 of 3channels measured

Where it's free now 3 channels tracked

OpenCode Zen live
no end announced
free since Oct 16
works · Oct 16per-IP limit
Checked Nov 1 · catalogue
ModelScope listed
no end announced
Checked Oct 28 · public record
Letta ended
ended 17 days ago
Oct 17
works · Oct 63 parallel
Checked Oct 17 · agent run

Also free through programs whose allowance covers this model · amounts are shared with other models

Freebuff Free Plan Daily Allowance live30 hours refilled daily, no card; usage measured in hours with a per-model multiplier a day account
Huawei Cloud CodeArts daily free tokens live10M tokens a day on the promo models; resets at 24:00 UTC+8, first come first served a day account
NVIDIA NIM Free Trial (build.nvidia.com) liveFree inference: up to 40 rpm / 10,000 requests per day (rate-limited trial) a day account

Free periods one bar per channel; markers are events

free so farpast announced endofficial end aheadinferred end aheadno end announcedended / not answering● event · ◆ end announced · tap one to see it

What happened newest first · times link to the source

Sat, Oct 1717 days ago
endedDeepSeek V4.1 Flash · Lettaended
Letta's free window for DeepSeek V4.1 Flash ended 2026-10-17: model requests now consume credits, and a free account with a $0.00 balance was refused with "minimum $1 in credits is required"; the pricing docs say model requests consume credits at a rate depending on model API pricing, and the per-model price page needs a login → end date Oct 17
Source: Letta pricing docs plus our own agent-run refusal (own check)
listedDeepSeek V4.1 Flash · OpenCode Zenlive
OpenRouter added deepseek/deepseek-v4.1-flash-1017 (created 2026-10-17T08:27:04Z): DeepSeek first-party endpoint only, no :free variant; DeepSeek upgraded V4.1 Flash in place to the 1017 snapshot with the API name (deepseek-flash) and pricing unchanged, so channels serving the unversioned deepseek-v4.1-flash id are on 1017 while their labels still say the old name
Source: OpenRouter models API and the DeepSeek changelog (own check)
snapshot updatedDeepSeek V4.1 Flash · OpenCode Zenlive DeepSeek V4.1 Flash · ModelScopelisted DeepSeek V4.1 Flash · Lettaended
DeepSeek V4.1 Flash upgraded in place to 1017; the API name deepseek-flash and the price are unchanged. Which snapshot each third-party channel serves is not recorded.
Source: DeepSeek API change log
Fri, Oct 1618 days ago
became availableDeepSeek V4.1 Flash · OpenCode Zenlive
DeepSeek V4.1 Flash is free on OpenCode Zen: listed Free for input, output and cached reads in the Zen price table, in the model catalogue, and three coding-agent runs on 2026-10-16 passed at zero cost
Source: OpenCode Zen model list, price table and our own agent runs
Tue, Oct 628 days ago
listedDeepSeek V4.1 Flash · Lettaended DeepSeek V4 Flash · Lettaended
Both carry a green "Free" badge in the Letta app's Hosted model list (other hosted models show "Quota" or "Out of credits"); V4.1 Flash ran an agent session on a free account. No official start or end date found
Source: own check
became availableQwen3.8 Flash · Qoderlive DeepSeek V4.1 Flash · Lettaended
Admitted to Dim's free worker pool after agent benchmarks: Qwen3.8-Flash via the Qoder CLI, and DeepSeek V4.1 Flash via the Letta Code CLI (about 3 parallel on the free plan)
Source: own check

Channel details

Letta ended✕ humans✕ agents

Tested by us
works · Oct 63 parallel0 credits usedfails silently over limit
ⓘheadless runs need a dedicated agent and --new · checked Oct 6
Model ID
deepseek/deepseek-v4.1-flash
To start
$0 · account Free plan: limited agents and requests, "rotating free models"
Use it
CLI only
Free condition
Letta Free plan, inside the Letta app, CLI or web app; counts toward the free tier's "standard model requests"
Limit (stated)
not published
ⓘrequest cap unpublished; 3 agents on Free
Started
not recorded; after Aug 13, when Letta still billed it to credits
End
ended 17 days ago Oct 17free window closed: since 2026-10-17 Letta bills this model to credits, and a free account at $0.00 is refused with "minimum $1 in credits is required"
Data policy
may train
Channel type
agent tool
Checked
Oct 17 · agent run

OpenCode Zen live✓ humans✓ agents

Tested by us
works · Oct 16per-IP limit0 credits used
ⓘ3 sequential coding-agent runs, all passed · checked Oct 16 · 3 checks
Model ID
opencode/deepseek-v4.1-flash-free
To start
$0 · no account Free models run inside the OpenCode app with no account; the Zen API key route needs billing details
Use it
CLI only
Free condition
Inside the OpenCode app, no account; the raw API refuses free models (403 FreeTierError); Limited time; no end date published
Limit (stated)
not published
Started
Oct 16
End
no end announced free since Oct 16
Data policy
no retention
Channel type
agent tool
Checked
Nov 1 · catalogue

ModelScope listed✓ humans✓ agents

Tested by us
not measured
Model ID
deepseek-ai/DeepSeek-V4.1-Flash
To start
$0 · account ModelScope account and access token; community reports say an Alibaba Cloud account with real-name verification must be bound
Use it
API · OpenAI chat
Free condition
Daily free API-Inference calls for registered users (a shared daily total; per-model caps vary)
Limit (stated)
published
ⓘ250 magicube/day shared
Started
API-Inference free calls (2000/day or 250 magicube)
End
no end announced
Data policy
not checked
Channel type
router
Checked
Oct 28 · public record