Claude Haiku 4.5 vs Gemini 3.5 Flash
Gemini 3.5 Flash is lower on a 1M-input + 1M-output mix (about 5% less), but Claude Haiku 4.5 has the lower input rate — real workloads skew toward input. Claude Haiku 4.5 offers 200K of context vs 1.05M for Gemini 3.5 Flash. Claude Haiku 4.5 answers on /v1/chat/completions and /v1/messages (Claude Code); Gemini 3.5 Flash on /v1/chat/completions.
Claude Haiku 4.5 and Gemini 3.5 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 4.5 vs Gemini 3.5 Flash: rates, context window, and capabilities
| Spec | Claude Haiku 4.5 | Gemini 3.5 Flash |
|---|---|---|
| Input / 1M tokens | $0.30 | $0.45 |
| Output / 1M tokens | $3.00 | $2.70 |
| Cached input / 1M tokens | $0.12 | $0.45 |
| Context window | 200K | 1.05M |
| Capabilities | Chat, Streaming, Tool calling, Vision | Chat, Streaming, Tool calling, Vision |
| Subscription plans | Standard models — Pro, Max, Ultra | Standard models — Pro, Max, Ultra |
| Detail page | Claude Haiku 4.5 | Gemini 3.5 Flash |
What does 1M tokens cost on Claude Haiku 4.5 vs Gemini 3.5 Flash?
For a workload of 1M input plus 1M output tokens at current rates: Claude Haiku 4.5 comes to $3.30, Gemini 3.5 Flash comes to $3.15 — Gemini 3.5 Flash is about 5% 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 4.5 and Gemini 3.5 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 4.5 on /v1/messages and /v1/chat/completions and Gemini 3.5 Flash on /v1/chat/completions only, so Claude Code (/v1/messages) runs only the Claude side. Check the Gemini side's vendor status too: per Google's Gemini API release notes (October 8, 2026; checked 2026-10-13), Google has deprecated gemini-3.5-flash on the Gemini API, tells developers to move to gemini-3.6-flash (or gemini-3.8-flash) and routes requests for gemini-3.5-flash to gemini-3.6-flash. For new work on the Gemini side, compare google/gemini-3.8-flash on your own prompts as well.
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-4.5", "messages": [{"role": "user", "content": "Hello"}]}'
# Same request, other model — change one string:
# "model": "google/gemini-3.5-flash"FAQ
Is Claude Haiku 4.5 cheaper than Gemini 3.5 Flash?
Input: Claude Haiku 4.5 $0.30 vs Gemini 3.5 Flash $0.45 / 1M tokens; Claude Haiku 4.5 has the lower rate. Output: Claude Haiku 4.5 $3.00 vs Gemini 3.5 Flash $2.70 / 1M tokens; Gemini 3.5 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 Claude Haiku 4.5 or Gemini 3.5 Flash included in a Router One subscription?
Claude Haiku 4.5 and Gemini 3.5 Flash both count 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, one pool shared by every model in that tier. Gemini 3.5 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 Claude Haiku 4.5 and Gemini 3.5 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 4.5 on /v1/messages and /v1/chat/completions and Gemini 3.5 Flash on /v1/chat/completions only, so Claude Code (/v1/messages) runs only the Claude side. Check the Gemini side's vendor status too: per Google's Gemini API release notes (October 8, 2026; checked 2026-10-13), Google has deprecated gemini-3.5-flash on the Gemini API, tells developers to move to gemini-3.6-flash (or gemini-3.8-flash) and routes requests for gemini-3.5-flash to gemini-3.6-flash. For new work on the Gemini side, compare google/gemini-3.8-flash on your own prompts as well.
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 2026-10-14 (UTC) and refresh within the hour.