Claude Haiku 5.5 vs DeepSeek V4.1 Flash
Claude Haiku 5.5 is the lower-priced of the two on Router One at base-tier rates (Claude Haiku 5.5: request input ≤ 100,000 tokens) — about 88% less on a 1M-input + 1M-output mix. Claude Haiku 5.5 offers 1.05M of context vs 1M for DeepSeek V4.1 Flash. Claude Haiku 5.5 answers on /v1/chat/completions and /v1/messages (Claude Code); DeepSeek V4.1 Flash on /v1/chat/completions, /v1/messages (Claude Code) and /v1/responses (Codex CLI).
Claude Haiku 5.5 and DeepSeek V4.1 Flash compared on current per-token rates, context window, and capabilities — both callable through one OpenAI-compatible endpoint with per-request cost traces.
Claude Haiku 5.5 vs DeepSeek V4.1 Flash: rates, context window, and capabilities
| Spec | Claude Haiku 5.5 | DeepSeek V4.1 Flash |
|---|---|---|
| Input / 1M tokens | $0.06 | $0.60 |
| Output / 1M tokens | $0.30 | $2.40 |
| Cached input / 1M tokens | $0.006 | $0.012 |
| Context window | 1.05M | 1M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Subscription plans | Not in any plan — wallet | Not in any plan — wallet |
| Detail page | Claude Haiku 5.5 | DeepSeek V4.1 Flash |
Claude Haiku 5.5: request input ≤ 100,000 tokens: Input $0.06 / 1M tokens, Output $0.30 / 1M tokens, Cache write $0.075 / 1M tokens, Cached input $0.006 / 1M tokens; request input > 100,000 tokens: Input $0.30 / 1M tokens, Output $1.50 / 1M tokens, Cache write $0.375 / 1M tokens, Cached input $0.03 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold.
What does 1M tokens cost on Claude Haiku 5.5 vs DeepSeek V4.1 Flash?
Base-tier rates: For a workload of 1M input plus 1M output tokens at current rates: Claude Haiku 5.5 comes to $0.36, DeepSeek V4.1 Flash comes to $3.00 — Claude Haiku 5.5 is about 88% 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 Claude Haiku 5.5 and DeepSeek V4.1 Flash
The API key and base URL stay the same, but this is not a one-string switch for every client. Router One serves Claude Haiku 5.5 on /v1/messages and /v1/chat/completions and DeepSeek V4.1 Flash on /v1/chat/completions, /v1/messages and /v1/responses, so Codex CLI (/v1/responses) runs only the DeepSeek side. Requests written for DeepSeek V4.1 Flash may need changes first: per Anthropic's Claude Haiku 5.5 migration guide (checked 2026-10-10), Claude Haiku 5.5 returns a 400 for sampling settings it does not accept (omit temperature, top_p and top_k) and for an assistant prefill as the last turn.
curl https://api.router.one/v1/chat/completions \
-H "Authorization: Bearer sk-your-router-one-key" \
-H "Content-Type: application/json" \
-d '{"model": "anthropic/claude-haiku-5.5", "messages": [{"role": "user", "content": "Hello"}]}'
# Same request, other model — change one string:
# "model": "deepseek-v4.1-flash"FAQ
Is Claude Haiku 5.5 cheaper than DeepSeek V4.1 Flash?
Compared at base-tier rates (Claude Haiku 5.5: request input ≤ 100,000 tokens). Input: Claude Haiku 5.5 $0.06 vs DeepSeek V4.1 Flash $0.60 / 1M tokens; Claude Haiku 5.5 has the lower rate. Output: Claude Haiku 5.5 $0.30 vs DeepSeek V4.1 Flash $2.40 / 1M tokens; Claude Haiku 5.5 has the lower rate. Total cost depends on the workload's input, output and cache usage. Claude Haiku 5.5: request input ≤ 100,000 tokens: Input $0.06 / 1M tokens, Output $0.30 / 1M tokens, Cache write $0.075 / 1M tokens, Cached input $0.006 / 1M tokens; request input > 100,000 tokens: Input $0.30 / 1M tokens, Output $1.50 / 1M tokens, Cache write $0.375 / 1M tokens, Cached input $0.03 / 1M tokens. The total input tokens in each request select the tier; its rates apply to the whole request, not only tokens above the threshold. Rates change; the /models page is the live source of truth.
Is Claude Haiku 5.5 or DeepSeek V4.1 Flash included in a Router One subscription?
Neither Claude Haiku 5.5 nor DeepSeek V4.1 Flash is in a Router One plan, so every call to either bills the wallet per token.
Can I switch between Claude Haiku 5.5 and DeepSeek V4.1 Flash without changing code?
The API key and base URL stay the same, but this is not a one-string switch for every client. Router One serves Claude Haiku 5.5 on /v1/messages and /v1/chat/completions and DeepSeek V4.1 Flash on /v1/chat/completions, /v1/messages and /v1/responses, so Codex CLI (/v1/responses) runs only the DeepSeek side. Requests written for DeepSeek V4.1 Flash may need changes first: per Anthropic's Claude Haiku 5.5 migration guide (checked 2026-10-10), Claude Haiku 5.5 returns a 400 for sampling settings it does not accept (omit temperature, top_p and top_k) and for an assistant prefill as the last turn.
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 2026-10-28 (UTC) and refresh within the hour.