Anthropic: claude-sonnet-4-5-20250929

claude-sonnet-4-5-20250929 is Anthropic's balanced model for coding, analysis, and agent workflows, released 2025-09-29. It offers strong reasoning and tool use for tasks where cost control matters alongside capability.

Modalities
inTextinImageinFileoutText
Price / 1M
$0.90 / $4.50
Context
200K

Channels

Every channel serves the same model, but they differ in price and stability. On each API key in the Platform, you pick a primary and a backup channel per vendor, and each billing line shows which channel served the request.

Provider
Discount
Input /M
Output /M
Cache read /M
Cache write 5m /M
Cache write 1h /M
Code_maxcheap
—
$0.90
$4.50
$0.09
$1.13
$1.80
Defaultstable
—
$2.70
$13.50
$0.27
$3.38
$5.40

Context pricing

This model’s price depends on how much input context a request carries. The headline price is the cheapest band, and a longer prompt moves the whole request into a higher one.

Input context
Input /M
Output /M
Cache read /M
Cache write /M
Cache write 1h /M
Code_maxcheap
standardBase
$0.90
$4.50
$0.09
$1.13
$1.80
Defaultstable
standardBase
$2.70
$13.50
$0.27
$3.38
$5.40

Capabilities

ReasoningVisionTool useLong context

Cost calculator

Pick a channel and a usage scenario, then drag the sliders to match your workload. Each scenario assumes a different prompt-cache hit rate.

Channel
Scenario
Unit $0.90 / $4.50 /1MDaily chat: 40% cache hit rate assumed · cache read $0.09 /1M
On MirAPI$271.30/ moCreate an API key

Showcase

Every chat model gets the same three fixed prompts. Outputs are archived verbatim, so you can copy a prompt and reproduce the result.

Task prompt · identical for all models
Build a single-file HTML page using three.js from a CDN: a low-poly planet with a tilted ring of ~200 orbiting particles, a soft key light plus rim light, slow auto-rotation, and drag-to-orbit controls. No build tools — one file only.
Archived output
Archive not published yet

Every model will run this exact prompt, and its output will appear here verbatim with token counts and the cost per run.

Quick start

import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.mirapi.ai/v1",   # changed
    api_key=os.environ["MIRAPI_API_KEY"],   # changed
)

resp = client.chat.completions.create(
    model="claude-sonnet-4-5-20250929",
    messages=[{"role": "user", "content": "Hello"}],
)
Wire claude-sonnet-4-5-20250929 into your product

1M free tokens to start, no card required. It’s OpenAI-compatible, so you only change the base URL.

Start free