Claude Sonnet 5.5 vs Claude Haiku 5.5: API Pricing, Limits & Cost Delta
Side-by-side 2026 engineering comparison between Anthropic Claude Sonnet 5.5 and Anthropic Claude Haiku 5.5—covering uncached input, cached prefix reads, output rates, max completion tokens, and live 30-day workload savings.
Interactive Workload Cost Delta Simulator
Side-by-Side Unit Price & Capability Matrix
| Dimension | Claude Sonnet 5.5 | Claude Haiku 5.5 |
|---|---|---|
| Provider & Release Date | Anthropic (2026-09-28) | Anthropic (2026-10-07) |
| Primary Workload Tier | Frontier Reasoning | Coding & Agent |
| Uncached Input ($ / 1M tokens) | $2 | $0.1 |
| Cached Prompt Read ($ / 1M tokens) | $0.1 | $0.01 |
| Output Completion ($ / 1M tokens) | $10 | $0.5 |
| 50% Async Batch API | Supported | Supported |
| Context Window (tokens) | 1,000,000 | 1,000,000 |
| Max Output Tokens | 128,000 | 128,000 |
| Function / Tool Calling | Supported | Supported |
| Strict JSON Schema Outputs | Supported | Supported |
| Reasoning Token Mode | Supported | Supported |
| Accepted Input Modalities | text, image, file | text, image, file |
Decision Rubric: When to Pick Claude Sonnet 5.5 vs Claude Haiku 5.5
When to choose Claude Sonnet 5.5 (Anthropic)
Select Claude Sonnet 5.5 when your workload prioritizes its Frontier Reasoning profile ($2/1M input, $0.1/1M cached read, $10/1M output) with up to 1,000,000 context tokens and 128,000 max output tokens (50% Batch API supported).
Claude Sonnet 5.5 full pricing sheet →When to choose Claude Haiku 5.5 (Anthropic)
Select Claude Haiku 5.5 when your workload prioritizes its Coding & Agent profile ($0.1/1M input, $0.01/1M cached read, $0.5/1M output) with up to 1,000,000 context tokens and 128,000 max output tokens (50% Batch API supported).
Claude Haiku 5.5 full pricing sheet →Frequently Asked Questions
Is Claude Sonnet 5.5 cheaper than Claude Haiku 5.5 for production API workloads?
On standard uncached rates, Claude Sonnet 5.5 bills $2/1M input and $10/1M output versus Claude Haiku 5.5 at $0.1/1M input and $0.5/1M output. On a typical 1,000 calls/day workload (4,000 input tokens at 50% cache hit + 800 output tokens), Claude Haiku 5.5 saves $347.40/month (95% lower).
How do Claude Sonnet 5.5 and Claude Haiku 5.5 compare on context window and max output tokens?
Claude Sonnet 5.5 offers a 1,000,000-token context window with 128,000 max output tokens (text, image, file), while Claude Haiku 5.5 provides a 1,000,000-token context window with 128,000 max output tokens (text, image, file).
Can I switch between Claude Sonnet 5.5 and Claude Haiku 5.5 with strict JSON Schema tool calling?
Both models can be evaluated locally in DevToken: Claude Sonnet 5.5 (tools: Supported, strict JSON Schema: Supported) vs Claude Haiku 5.5 (tools: Supported, strict JSON Schema: Supported). Always verify rate-limit headroom in the 429 Calculator before cutover.