DeepSeek V4.1 Flash vs Gemini 3.8 Flash
Gemini 3.8 Flash is the lower-priced of the two on Router One — about 55% less on a 1M-input + 1M-output mix. DeepSeek V4.1 Flash offers 1M of context vs 1.05M for Gemini 3.8 Flash. DeepSeek V4.1 Flash answers on /v1/chat/completions, /v1/messages (Claude Code) and /v1/responses (Codex CLI); Gemini 3.8 Flash on /v1/chat/completions. DeepSeek V4.1 Flash is in no plan and bills the wallet; Gemini 3.8 Flash counts against the Standard models allowance on Pro, Max and Ultra.
DeepSeek V4.1 Flash and Gemini 3.8 Flash compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint with per-request cost traces.
DeepSeek V4.1 Flash vs Gemini 3.8 Flash: rates, context window, and capabilities
| Spec | DeepSeek V4.1 Flash | Gemini 3.8 Flash |
|---|---|---|
| Input / 1M tokens | $0.60 | $0.225 |
| Output / 1M tokens | $2.40 | $1.125 |
| Cached input / 1M tokens | $0.012 | $0.225 |
| Context window | 1M | 1.05M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Subscription plans | Not in any plan — wallet | Standard models — Pro, Max, Ultra |
| Detail page | DeepSeek V4.1 Flash | Gemini 3.8 Flash |
What does 1M tokens cost on DeepSeek V4.1 Flash vs Gemini 3.8 Flash?
For a workload of 1M input plus 1M output tokens at current rates: DeepSeek V4.1 Flash comes to $3.00, Gemini 3.8 Flash comes to $1.35 — Gemini 3.8 Flash is about 55% cheaper on this mix. Real workloads skew heavily toward input tokens, so weigh the input rate by your own ratio; the cached-input row above is the posted catalog rate for that model.
Switch between DeepSeek V4.1 Flash and Gemini 3.8 Flash
Both models answer on /v1/chat/completions, so an A/B test there is a one-string change — same key, same code, and every request traced with tokens, cost, and latency in the dashboard. Claude Code uses /v1/messages, which Router One lists for DeepSeek V4.1 Flash but not Gemini 3.8 Flash; Codex CLI uses /v1/responses, which Router One lists for DeepSeek V4.1 Flash but not Gemini 3.8 Flash — so in those tools, switch the tool (or call /v1/chat/completions), not only the model string.
curl https://api.router.one/v1/chat/completions \
-H "Authorization: Bearer sk-your-router-one-key" \
-H "Content-Type: application/json" \
-d '{"model": "deepseek-v4.1-flash", "messages": [{"role": "user", "content": "Hello"}]}'
# Same request, other model — change one string:
# "model": "google/gemini-3.8-flash"FAQ
Is DeepSeek V4.1 Flash cheaper than Gemini 3.8 Flash?
Input: DeepSeek V4.1 Flash $0.60 vs Gemini 3.8 Flash $0.225 / 1M tokens; Gemini 3.8 Flash has the lower rate. Output: DeepSeek V4.1 Flash $2.40 vs Gemini 3.8 Flash $1.125 / 1M tokens; Gemini 3.8 Flash has the lower rate. Total cost depends on the workload's input, output and cache usage. Rates change; the /models page is the live source of truth.
Is DeepSeek V4.1 Flash or Gemini 3.8 Flash included in a Router One subscription?
DeepSeek V4.1 Flash is in no Router One plan, so every call bills the wallet per token. Gemini 3.8 Flash counts against the Standard models allowance on Pro, Max and Ultra: Pro 5,000, Max 8,000 and Ultra 25,000 requests per 30-day cycle, shared by every model in that tier. Gemini 3.8 Flash requests above its long-context threshold count as more than one quota request. Requests beyond a plan's allowance bill the wallet per token.
Can I switch between DeepSeek V4.1 Flash and Gemini 3.8 Flash without changing code?
On /v1/chat/completions, yes — change the model string; the key and base URL stay the same. Claude Code uses /v1/messages, which Router One lists for DeepSeek V4.1 Flash but not Gemini 3.8 Flash; Codex CLI uses /v1/responses, which Router One lists for DeepSeek V4.1 Flash but not Gemini 3.8 Flash — so in those tools, switch the tool (or call /v1/chat/completions), not only the model string.
Where do these numbers come from?
Specs and prices on this page render from the live Router One catalog — the same data as the /models page — and refresh with it. Pricing methodology is documented on /pricing-methodology. Rates on this page were read from the live catalog on 2026-10-26 (UTC) and refresh within the hour.