Cheap Claude Sonnet 5.5 API: Get Up to 66% Off
Sonnet 5.5 API from $0.670392 input / $3.35196 output per 1M tokens. Compare Anthropic, Batch and OpenRouter, coding budgets and API key setup.
Published
Get Claude Sonnet 5.5 from $0.670392 input / $3.35196 output: up to 66% below Anthropic Standard. There are 6 public routes. Buy the same Sonnet model at a lower token rate instead of replacing it with a smaller model.
Checked 2026-11-04 03:32 UTC. Prices are USD per 1M input / output tokens; the table shows the lowest and highest input-priced public route as input / output pairs. Counts exclude client-only routes. The live marketplace card controls current price and availability.
| Model ID | Official reference price | APIMaster current price | Active routes | Discount | Model card |
|---|---|---|---|---|---|
claude-sonnet-5-5 |
$2 / $10 | $0.670392 / $3.35196 – $2 / $10 | 6 | Up to 66% off | Compare routes |
The reference is Anthropic's current global Standard price, $2 / $10. The maximum saving applies to the lowest route, not all routes. Claude Pro/Max subscriptions are not API balances.
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Claude Sonnet 5.5 API pricing: official vs OpenRouter vs APIMaster
| Provider / model | Input / output | Billing condition | APIMaster saving |
|---|---|---|---|
| APIMaster · claude-sonnet-5-5 | $0.670392 / $3.35196 | Standard, uncached | — |
| Anthropic Standard | $2 / $10 | Standard, uncached | At least 66% lower token rates |
| Anthropic Batch | $1 / $5 | Asynchronous Batch | At least 32% lower token rates |
| OpenRouter · anthropic/claude-sonnet-5.5 | $2 / $10 | Catalog snapshot; provider terms apply | At least 66% lower token rates |
Anthropic Batch is $1 / $5, so the lowest APIMaster rate is about 32.96% below Batch token rates; synchronous and asynchronous products have different terms. US-only official inference carries a 1.1× multiplier. Official cache reads are $0.10, 5-minute writes $2.50 and 1-hour writes $4 per 1M tokens: compare them separately.
What does a real token budget cost?
Budget: 100,000 uncached input tokens + 20,000 billed output tokens per task. Formula: input_tokens × input_rate / 1,000,000 + output_tokens × output_rate / 1,000,000. This is arithmetic, not a measured model benchmark.
| Model ID | Official reference / task | APIMaster from / task | APIMaster / 1,000 tasks |
|---|---|---|---|
claude-sonnet-5-5 |
$0.4 | $0.134078 | $134.08 |
The 1,000-task column scales the same budget; it is not a bulk discount. Figures are rounded and exclude cache, storage, search/tools, taxes and retries. Include billed reasoning output and every agent call. Different models can consume different token counts; compare cost per accepted result.
Which Claude Sonnet 5.5 model or route should you buy?
For code review, bug fixes and well-scoped agents, compare Sonnet 5.5 routes using your existing tests. A 1,000-task budget in the table costs about $134.08 here versus $400 at official Standard, a saving of about $265.92 before extras. It does not predict task success or latency.
For Claude Code, use the separate client-compatible routes and setup instructions in the linked guide. The 6-route count above excludes Claude Code-only routes; their prices, features and authentication can differ. Sonnet API usage does not include an official Claude Code subscription.
Choose the route inside the same model card and confirm supported tools, streaming and limits. Fingerprint results are route-specific identity evidence; availability records are point-in-time checks, not an uptime guarantee. Missing test records do not count as passes.
How to get a discounted Claude Sonnet 5.5 API key
Compare the live model card → register → fund your wallet → create an API key. Use your APIMaster key, https://apimaster.ai/v1, and the exact model ID claude-sonnet-5-5:
curl "https://apimaster.ai/v1/chat/completions" \
-H "Authorization: Bearer $APIMASTER_API_KEY" \
-H "Content-Type: application/json" \
-d '{"model":"claude-sonnet-5-5","max_tokens":512,"messages":[{"role":"user","content":"Return a JSON object with a short summary of: API costs depend on token usage."}]}'
This is a minimal integration example, not a new paid inference test. Check endpoint compatibility, returned usage and your first small bill before increasing traffic. An APIMaster key does not fund an account at the original vendor.
FAQ
Is this the cheapest API on the internet?
No universal lowest-price claim is made. This guide compares the checked public routes and named billing modes; another provider or specialized route can be cheaper.
Does an app subscription include these API credits?
Treat app subscriptions, coding plans and pay-as-you-go API wallets as separate products unless their terms explicitly include the same usage.
Does the headline discount also cover cache hits?
No. Compare cached reads, cache writes, storage, tools and timing separately; ordinary token discounts do not prove the same saving on every billing item.
Does the GPT trial promotion provide this model for free?
The GPT trial offer is separate. It does not promise free credits for the models in this guide; check the current trial catalog and eligibility.
Sources and related guides
Official pricing · OpenRouter model catalog
Claude Sonnet 5.5 · Sonnet 5.5 · API · Cheap Claude Opus
Other cheap API guides: Gemini Flash · DeepSeek · GLM · Qwen
Get started: Compare the live model card → register → fund your wallet → create an API key. Use your APIMaster key, https://apimaster.ai/v1, and the exact model ID claude-sonnet-5-5