Claude Sonnet 5 vs Claude Sonnet 5.5 API Cost Calculator
Side-by-side FinOps unit economics audit comparing Claude Sonnet 5 (Anthropic) against Claude Sonnet 5.5 (Anthropic). On an uncached 3:1 workload (3,500 input / 800 output tokens, 0% prompt cache), Claude Sonnet 5 cuts blended token spend by 0% and saves $0.0000/mo ($0.0000/yr) at 10,000 DAU. With 65% Prompt Caching enabled (interactive simulator default: $0.20/1M vs $0.10/1M cache reads), 10K DAU monthly spend is $39,258/mo (Claude Sonnet 5) vs $38,439/mo (Claude Sonnet 5.5).
1. Side-by-Side Token Pricing, Context Window & Speed Matrix
Exact API pricing per 1 Million tokens (Input, Output, and Prompt Cache Read), maximum context window, and real-world streaming throughput.
| FinOps Metric | Claude Sonnet 5 (Anthropic) | Claude Sonnet 5.5 (Anthropic) | Arbitrage Advantage |
|---|---|---|---|
| Input Price (per 1M tokens) | $2.00 / 1M | $2.00 / 1M | Claude Sonnet 5 (1.0x cheaper) |
| Output Price (per 1M tokens) | $10.00 / 1M | $10.00 / 1M | Claude Sonnet 5 (1.0x cheaper) |
| Cached Input Read (per 1M) | $0.20 / 1M | $0.10 / 1M | Prompt Cache Hit Discount Ready |
| Blended 3:1 RAG Rate (per 1M) | $4.00 / 1M | $4.00 / 1M | 0% savings with Claude Sonnet 5 |
| Context Window / Max Output | 1M (1,000,000) / 128K out | 1M (1,000,000) / 128K out | Claude Sonnet 5 larger context |
| Streaming Speed & TTFT | 96 tok/s (310ms TTFT) | 96 tok/s (310ms TTFT) | Claude Sonnet 5 faster generation |
| Capabilities (Tools / Vision / Cache) | Tools: Yes · Vision: Yes · Cache: Yes | Tools: Yes · Vision: Yes · Cache: Yes | JSON Mode: Both Supported |
2. Monthly SaaS Cloud Bill Simulation (1,000 DAU / 10,000 DAU / 50,000 DAU)
Simulated monthly API spend for a production AI SaaS application (12 requests per active user/day, 3,500 input tokens + 800 output tokens per turn, 30 days/month).
| SaaS Scale Tier | Monthly Token Volume | Claude Sonnet 5 Monthly Bill | Claude Sonnet 5.5 Monthly Bill | Monthly Savings (Claude Sonnet 5) |
|---|---|---|---|---|
| 1,000 DAU (Seed / MVP) | 1.26B in / 288M out | $5,400/mo | $5,400/mo | Save $0.0000/mo |
| 10,000 DAU (Growth SaaS) | 12.6B in / 2.88B out | $54,000/mo | $54,000/mo | Save $0.0000/mo ($0.0000/yr) |
| 50,000 DAU (Enterprise Scale) | 63.0B in / 14.4B out | $270,000/mo | $270,000/mo | Save $0.0000/mo |
Customize Your Exact DAU, Turns/Day & Prompt Cache Hit Rate
3. Prompt Caching Savings Math (At 10,000 DAU Workload)
Long system prompts, RAG document context, and multi-turn agent histories qualify for automatic or explicit prompt caching. Here is how cache hit rates change your monthly cloud bill:
| Prompt Cache Hit Rate | Claude Sonnet 5 (Read @ $0.20/1M) | Claude Sonnet 5.5 (Read @ $0.10/1M) | Combined Hybrid Router + 75% Cache |
|---|---|---|---|
| 0% Cache Hit (Cold Prompts) | $54,000/mo | $54,000/mo | $54,000/mo |
| 50% Cache Hit (Standard Chat) | $42,660/mo | $42,030/mo | $42,534/mo |
| 75% Cache Hit (Production Agent/RAG) | $36,990/mo | $36,045/mo | $36,801/mo |
| 90% Cache Hit (Heavy Document Context) | $33,588/mo | $32,454/mo | $33,361/mo |
4. Multi-Provider Host Arbitrage & Latency Disparity Table (Cost vs. <400ms TTFT SLA)
Don't overpay default gateway markups or suffer peak-hour latency spikes. Compare verified inference hosts for both Claude Sonnet 5 and Claude Sonnet 5.5 anchored by Cost-per-1M Tokens vs. Time-to-First-Token (TTFT < 400ms SLA):
| Model | Inference Host / Gateway | Input / 1M | Output / 1M | Cache Read / 1M | TTFT Latency & SLA | Throughput | Deploy / Credits Link |
|---|---|---|---|---|---|---|---|
| Claude Sonnet 5 | Anthropic Direct / Primary #1 Smart Router Pick | $2.00 | $10.00 | $0.20 | 292ms <400ms SLA ✓ | 96 tok/s | Deploy (Prompt Caching Ready) → |
| Claude Sonnet 5 | OpenRouter (0% Markup Failover) | $2.00 | $10.00 | $0.20 | 304ms <400ms SLA ✓ | 92 tok/s | Deploy (Unified API for 470+ Models) → |
| Claude Sonnet 5.5 | Anthropic Direct / Primary | $2.00 | $10.00 | $0.10 | 292ms <400ms SLA ✓ | 96 tok/s | Deploy (Prompt Caching Ready) → |
| Claude Sonnet 5.5 | OpenRouter (0% Markup Failover) | $2.00 | $10.00 | $0.10 | 304ms <400ms SLA ✓ | 92 tok/s | Deploy (Unified API for 470+ Models) → |
5. Frequently Asked Questions (Claude Sonnet 5 vs Claude Sonnet 5.5)
6. Related FinOps Comparisons & Model Calculators
Drop Your Usage CSV, Paste Your System Prompt, or Rescue Your Monthly LLM Bill
100% browser-local FinOps auditing: drop your OpenRouter / OpenAI / Anthropic / Cursor usage CSV, count 20-turn agent loop bloat from your system prompt, or model instant savings across 61 models.
Export your 30-day activity CSV from OpenRouter, Anthropic Console, OpenAI Usage, or Cursor/Cline and drop it below (or paste raw CSV rows). Everything runs in your browser memory — no API keys or logs ever leave your device.
Embed Live Claude Sonnet 5 Token Price Badge in Your GitHub README or Docs
Keep your open-source repo or internal engineering wiki automatically synced with live Claude Sonnet 5 input/output pricing:
Multi-Turn Agent Context Overflow & Architecture-Specific FinOps Verdict (Claude Sonnet 5 vs Claude Sonnet 5.5)
1. Multi-Turn Agent Context Window Ceiling: On a cumulative autonomous agent loop accumulating 6,800 tokens/turn (system prompt + tool JSON schema + conversation history), Claude Sonnet 5 (1,000,000 token context window, 128,000 max output) reaches context saturation at Turn 147, whereas Claude Sonnet 5.5 (1,000,000 token context window, 128,000 max output) saturates at Turn 147.
2. Prompt Cache Hit Economics (90% vs 95% Read Discount): Claude Sonnet 5 discounts cached prefix reads by 90% ($0.20/1M vs $2.00/1M uncached), while Claude Sonnet 5.5 discounts cached reads by 95% ($0.10/1M vs $2.00/1M uncached). At a 65% production cache hit ratio across 10,000 DAU, net monthly spend is $39,258/mo vs $38,439/mo.
3. Serverless API vs. Dedicated H100 vLLM Break-Even Threshold: Benchmarked against a dedicated $2,150/mo NVIDIA H100 80GB node (DigitalOcean H100 GPU Droplets / $300 Vultr GPU credit), serverless API billing on Claude Sonnet 5 remains cheaper than dedicated GPU provisioning up to 548 DAU, while Claude Sonnet 5.5 breaks even against dedicated GPU hosting at 559 DAU.
With a massive 1,000,000-token context window, Claude Sonnet 5 can ingest entire code repositories or multi-document corpora without vector chunking—provided your architecture pins static context at the top of the prompt for prefix caching ($0.20/1M cached read):
- 100,000-Token Full-Repo Prompt (0% Uncached): $208.00 per 1,000 queries
- 100,000-Token Prompt with 90% Prefix Cache Hit: $46.00 per 1,000 queries (saves $162.00 per 1K calls)
- Top-5 Vector RAG Retrieval (4,000-Token Chunk): $16.00 per 1,000 queries (lowest cost when cross-document global reasoning is not required).
With a massive 1,000,000-token context window, Claude Sonnet 5.5 can ingest entire code repositories or multi-document corpora without vector chunking—provided your architecture pins static context at the top of the prompt for prefix caching ($0.10/1M cached read):
- 100,000-Token Full-Repo Prompt (0% Uncached): $208.00 per 1,000 queries
- 100,000-Token Prompt with 90% Prefix Cache Hit: $37.00 per 1,000 queries (saves $171.00 per 1K calls)
- Top-5 Vector RAG Retrieval (4,000-Token Chunk): $16.00 per 1,000 queries (lowest cost when cross-document global reasoning is not required).
