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Anthropic: Claude Haiku 4.5 Thinking

claude-haiku-4.5:thinking

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Claude Haiku 4.5 Thinking costs $1.30 per million input tokens and $6.50 per million output tokens, supports 200K context, and is available through the OpenAI-compatible API.

Claude Haiku 4.5 with extended thinking enabled for deeper planning, more deliberate coding, and multi-step reasoning without moving up to Sonnet pricing.

Modalities

Text + Image → Text

Input / output price

$1.30 / $6.50 per 1M

Context

200K · max output 64K

Capabilities

ReasoningVisionTool calling

Pricing

Billed per token actually used and deducted from your credits.

ItemUSD per 1M tokens
Input$1.30
Output$6.50
Cached input$0.130

Calculator

Drag the sliders to estimate what this model will cost.

Per request
$0.00910
Per day
$4.55
Per month (30 days)
$136.50

Claude Haiku 4.5 Thinking: input $1.3/M · output $6.5/M · cached input $0.13/M

Request with these settings
curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "claude-haiku-4.5:thinking", "max_tokens": 800,
       "messages": [{"role": "user", "content": "…"}]}'

Code samples

OpenAI-compatible. Set the base URL to https://api.geniusrelaygpt.com/v1 and the model to claude-haiku-4.5:thinking.

curl https://api.geniusrelaygpt.com/v1/chat/completions \
  -H "Authorization: Bearer $API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "claude-haiku-4.5:thinking",
    "stream": true,
    "messages": [{"role": "user", "content": "Hello"}]
  }'

Use it in a client: Cursor · Cline · SillyTavern · Codex

Parameters

Common OpenAI parameters can be passed as-is.

temperaturetop_pmax_tokensstreamstoppresence_penaltyfrequency_penaltyseed

FAQ

How is Claude Haiku 4.5 Thinking billed?
Input is $1.30 and output is $6.50 per million tokens; cached input is $0.130. The charge for every request is listed in Usage Logs in the console.
How long is the context window?
200K tokens. In a long conversation every turn is billed for the full input, so keep the history under control.
Does it support streaming?
Yes. Add "stream": true to the request to receive server-sent events in the OpenAI format.
Claude Haiku 4.5 Thinking API pricing · GeniusRelay