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claude-opus-5-fast pricing and usage · CheaperInference

Model record / Anthropic

claude-opus-5-fast

Access claude-opus-5-fast from Anthropic through one OpenAI-compatible API with live market-linked pricing and usage-based billing.

Text generationVision inputReasoningStreaming27% below list

Input / 1M tokens~~$10.00 list~~$7.30

Output / 1M tokens~~$50.00 list~~$36.50

Cached input / 1M tokens~~$1.00 list~~$0.73

Current discount27%

Observed reliability

96.28

Successful provider-reaching requests

Output speed

246

Median tokens per second over sustained generations

TTFT

4 s

p50 · p90 9.8 s · n 49

Latency

7 s

p50 · p90 14 s · n 181

Evidence strength

—

Provider: Anthropic
Model ID: claude-opus-5-fast
Type: Text generation
Endpoints: /v1/chat/completions, /v1/responses, /v1/messages
Input: image, pdf, text
Output: text
Vision input: Supported
Image editing: Not supported
Video input: Not supported
Reasoning: Supported
Streaming: Supported
Context window: 1,000,000 tokens

POST /v1/chat/completions

Field	Values
reasoning.exclude
max_tokens
reasoning	effort: none, low, medium, high, xhigh, max; max_tokens: 1024 to max output tokens; enabled: true or false
response_format
stop
tool_choice
tools

POST /v1/messages

Field	Values
max_tokens
stop_sequences

Pricing history

See how much this model saves and when its recorded price has been lowest.

Time zone

claude-opus-5-fast

Growing confidence

This model averaged 29.6% below comparable direct provider prices across the selected range. Its strongest observed window was 12:00 AM–1:00 AM in UTC.

Last 24 hours

Average saved

29.6%

Last 24 hours

Cheapest time

12:00 AM–1:00 AM

35.0% average savings

Hourly coverage

23/24

23 total observations

Signal quality

Growing

Ready for planning

Typical unit savings$2.96 / 1M input tokens$14.79 / 1M output tokens

Hover a bar for savings per token and observation counts.

Source buckets are UTC; labels are converted to UTC.

Last 24 hours

#145

of 408 ranked models

Last 7 days

#181

of 418 ranked models

Last 30 days

#107

of 418 ranked models

Ready when you are

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Marketplace pricing, capped at list, optimized further.

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POST /v1/chat/completions

curl https://api.cheaperinference.com/v1/chat/completions \  -H "Authorization: Bearer ci_live_YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "model": "claude-opus-5-fast",    "messages": [      {        "role": "user",        "content": "Reply with the single word OK."      }    ],    "max_tokens": 64  }'

POST /v1/responses

curl https://api.cheaperinference.com/v1/responses \  -H "Authorization: Bearer ci_live_YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "input": [      {        "role": "user",        "content": "Reply with the single word OK."      }    ],    "model": "claude-opus-5-fast",    "store": false,    "max_output_tokens": 256  }'

POST /v1/messages

curl https://api.cheaperinference.com/v1/messages \  -H "Authorization: Bearer ci_live_YOUR_API_KEY" \  -H "Content-Type: application/json" \  -d '{    "model": "claude-opus-5-fast",    "messages": [      {        "role": "user",        "content": "Reply with the single word OK."      }    ],    "max_tokens": 64  }'