Claude Sonnet 4.5 (20250929)

Snapshot of Claude Sonnet 4.5 from September 29, 2025. Most intelligent model with exceptional coding and reasoning.

Input price
$3.30
Output price
$16.50
Context
200K
Max output
64K
Modalities
InputTextImagePDFOutputText
147 (#58 of 89)
1439
—
Released
2025-09-29
Knowledge cutoff
2025-01-31
Try in ChatCompare

Providers

Providers that serve this model. With Auto, each request goes to the best available provider. Prices in USD per 1M tokens; stats cover the last 30 days.

Pricing

Prices vary by provider. Showing Anthropic, the lowest. Pick a provider above to see its prices.

Input
$3.30
per 1M tokens
Output
$16.50
per 1M tokens
Cache read
$0.33
per 1M tokens
Cache write (5 min)
$4.125
per 1M tokens
Cache write (1 hour)
$6.60
per 1M tokens
Batch input
$1.65
per 1M tokens
Batch output
$8.25
per 1M tokens
Web search
$0.011
per request

Make a request

Set your provider preferences, then copy the request. It reads your API key from OHMYGPT_API_KEY.

Anthropic Messages supports pinning one provider only. Other preferences work with Chat Completions and Responses.

curl https://api.ohmygpt.com/v1/messages \
  -H "x-api-key: $OHMYGPT_API_KEY" \
  -H "Content-Type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{
    "model": "anthropic/claude-sonnet-4-5-20250929",
    "max_tokens": 1024,
    "messages": [
      {
        "role": "user",
        "content": "Hello"
      }
    ]
  }'

Similar models

Other models with the same output types at a similar price.

  • Better value: more capable, lower price
  • Pareto frontier
  • Similar models

Capability scores are from Epoch AI’s Epoch Capabilities Index (CC BY 4.0, as of 2026-11-02), which combines dozens of benchmarks with GPT-5 set at 150. epoch.ai/eci

Price: our current input price per 1M tokens in USD, lowest across channels. Dated snapshots and resold copies of the same model are merged into one point; free models are not shown.

Shaded area: capability above and price below the median of all models. Pareto frontier: no other model is both cheaper and more capable.

Claude Sonnet 4.5 (20250929)This model
147
Input
$3.30
Output
$16.50
Claude Sonnet 4.6
153
Input
$3.30
Output
$16.50
Gemini 3.5 Transcribe Live
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Input
$3.15
Output
$18.90
GPT-5.6
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Input
$3.60–$7.20
Output
$18.00–$27.00
Ember-1
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Input
$3.00
Output
$15.00

Human preference ratings are from the LMArena Text Arena (CC BY 4.0, as of 2026-10-28): Elo ratings from blind votes, on a different scale from capability scores. lmarena.ai/leaderboard/text