DeepSeek V4.1 Flash vs Claude Haiku 4.5
DeepSeek V4.1 Flash is lower on a 1M-input + 1M-output mix (about 9% less), but Claude Haiku 4.5 has the lower input rate — real workloads skew toward input. DeepSeek V4.1 Flash offers 1M of context vs 200K for Claude Haiku 4.5. DeepSeek V4.1 Flash answers on /v1/chat/completions, /v1/messages (Claude Code) and /v1/responses (Codex CLI); Claude Haiku 4.5 on /v1/chat/completions and /v1/messages (Claude Code). DeepSeek V4.1 Flash is in no plan and bills the wallet; Claude Haiku 4.5 counts against the Standard models allowance on Pro, Max and Ultra.
DeepSeek V4.1 Flash and Claude Haiku 4.5 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 Claude Haiku 4.5: rates, context window, and capabilities
| Spec | DeepSeek V4.1 Flash | Claude Haiku 4.5 |
|---|---|---|
| Input / 1M tokens | $0.60 | $0.30 |
| Output / 1M tokens | $2.40 | $3.00 |
| Cached input / 1M tokens | $0.012 | $0.12 |
| Context window | 1M | 200K |
| 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 | Claude Haiku 4.5 |
What does 1M tokens cost on DeepSeek V4.1 Flash vs Claude Haiku 4.5?
For a workload of 1M input plus 1M output tokens at current rates: DeepSeek V4.1 Flash comes to $3.00, Claude Haiku 4.5 comes to $3.30 — DeepSeek V4.1 Flash is about 9% 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 Claude Haiku 4.5
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. Codex CLI uses /v1/responses, which Router One lists for DeepSeek V4.1 Flash but not Claude Haiku 4.5 — so in that tool, 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": "anthropic/claude-haiku-4.5"FAQ
Is DeepSeek V4.1 Flash cheaper than Claude Haiku 4.5?
Input: DeepSeek V4.1 Flash $0.60 vs Claude Haiku 4.5 $0.30 / 1M tokens; Claude Haiku 4.5 has the lower rate. Output: DeepSeek V4.1 Flash $2.40 vs Claude Haiku 4.5 $3.00 / 1M tokens; DeepSeek V4.1 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 Claude Haiku 4.5 included in a Router One subscription?
DeepSeek V4.1 Flash is in no Router One plan, so every call bills the wallet per token. Claude Haiku 4.5 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. Requests beyond a plan's allowance bill the wallet per token.
Can I switch between DeepSeek V4.1 Flash and Claude Haiku 4.5 without changing code?
On /v1/chat/completions, yes — change the model string; the key and base URL stay the same. Codex CLI uses /v1/responses, which Router One lists for DeepSeek V4.1 Flash but not Claude Haiku 4.5 — so in that tool, 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.