Claude Haiku 4.5 vs Claude Sonnet 5.5: pricing and benchmarks
Claude Haiku 4.5 is 50% cheaper on input tokens ($1.00 vs $2.00 per 1M). Claude Haiku 4.5 is 50% cheaper on output tokens ($5.00 vs $10.00 per 1M). On our document Q&A workload (50,000 questions a month), Claude Haiku 4.5 costs $550.00 a month versus $1,100 for Claude Sonnet 5.5, 50% less. Claude Sonnet 5.5 scores 164.4 on the Epoch Capabilities Index vs 142.4 for Claude Haiku 4.5.
Which should you choose?
Claude Sonnet 5.5 scores 164.4 on the Epoch Capabilities Index vs 142.4 for Claude Haiku 4.5.
Claude Haiku 4.5 costs $2.00 per 1M tokens (3:1 input-to-output mix) vs $4.00 for Claude Sonnet 5.5, 50% less.
A trade-off: Claude Sonnet 5.5 is 22.0 ECI points more capable but costs 2.0x as much as Claude Haiku 4.5.
Pricing and specs
| Claude Haiku 4.5 | Claude Sonnet 5.5 | |
|---|---|---|
| Provider | Anthropic | Anthropic |
| API model ID | claude-haiku-4-5-20251001 | claude-sonnet-5-5 |
| Input / 1M tokens | $1.00 | $2.00 |
| Cached input / 1M tokens | $0.10 | $0.20 |
| Output / 1M tokens | $5.00 | $10.00 |
| Long-context rates | — | — |
| Context window | 200K tokens | 1M tokens |
| Max output | 64K tokens | 128K tokens |
| Batch discount | 50% off | 50% off |
Benchmarks
| Claude Haiku 4.5 | Claude Sonnet 5.5 | |
|---|---|---|
| Epoch Capabilities Index | 142.4 | 164.4 |
| GPQA Diamond· Science reasoning | 71.2% | 95.6% |
| FrontierMath (Tiers 1–3)· Advanced math | — | 88.8% |
| SimpleQA Verified· Factual accuracy | 13.2% | 46.5% |
| ARC-AGI-2· Abstract reasoning | 4.0% | — |
| DeepSWE· Coding | — | — |
| APEX-Agents· Agentic work | — | 75.5% |
Source: Epoch AI, best recorded result per model (CC BY 4.0). A dash means no published score. See all benchmarks
Monthly cost for real workloads
| Workload | Claude Haiku 4.5 | Claude Sonnet 5.5 | Difference |
|---|---|---|---|
Support chatbot 100,000 replies a month, ~1,500 input tokens (system prompt + history) and ~400 output tokens each. | $350.00 | $700.00 | Claude Haiku 4.5 50% cheaper |
Document Q&A (RAG) 50,000 questions a month with ~8,000 tokens of retrieved context and ~600 output tokens each. | $550.00 | $1,100 | Claude Haiku 4.5 50% cheaper |
Coding agent 10,000 agent steps a month, ~40,000 input tokens each (70% read from the prompt cache) and ~2,000 output tokens. | $248.00 | $496.00 | Claude Haiku 4.5 50% cheaper |
Cached chatbot The same 100,000-reply support chatbot, but 60% of each prompt (system prompt + conversation history) is served from the prompt cache. | $269.00 | $538.00 | Claude Haiku 4.5 50% cheaper |
Meeting notes 10,000 meetings a month summarized from ~12,000-token transcripts, ~1,000 output tokens each. | $170.00 | $340.00 | Claude Haiku 4.5 50% cheaper |
Bulk translation 200,000 short translations a month, ~800 input and ~800 output tokens each. | $960.00 | $1,920 | Claude Haiku 4.5 50% cheaper |
Content moderation 1,000,000 classifications a month, ~400 input tokens and ~80 output tokens each. | $800.00 | $1,600 | Claude Haiku 4.5 50% cheaper |
Article drafting 300 long-form articles a month written from a ~4,000-token brief and outline, ~5,000 output tokens each. | $8.70 | $17.40 | Claude Haiku 4.5 50% cheaper |
Code review bot 30,000 pull-request reviews a month, ~5,000 input tokens each (30% cached repository context) and ~700 output tokens. | $214.50 | $429.00 | Claude Haiku 4.5 50% cheaper |
Invoice extraction 100,000 documents a month parsed into structured JSON, ~1,200 input and ~250 output tokens each. | $245.00 | $490.00 | Claude Haiku 4.5 50% cheaper |
Estimates use standard list prices and ignore cache-write surcharges. Different tokenizers can count the same text differently, so test with your own prompts.
Claude Haiku 4.5 vs Claude Sonnet 5.5 cost calculator
- $550.00/mo$0.01 / req
- Claude Sonnet 5.5Anthropic$1,100/mo$0.02 / req
Standard-tier list prices. Long-context rates apply automatically where the provider publishes a threshold. Excludes cache-write surcharges, taxes, batch and volume discounts.
Claude Haiku 4.5 pricing notes
Anthropic’s previous-generation Haiku model, with a 200K-token context window.
- Cache writes cost $1.25 (5-minute cache) or $2 (1-hour cache) per 1M tokens.
- Uses Anthropic’s previous tokenizer.
Claude Sonnet 5.5 pricing notes
Anthropic’s fast mid-tier model, successor to Claude Sonnet 5 at the same price.
- Cache writes cost $2.50 (5-minute cache) or $4 (1-hour cache) per 1M tokens.
- US-only inference (inference_geo: "us") costs 1.1x.
Frequently asked questions
- Is Claude Haiku 4.5 cheaper than Claude Sonnet 5.5?
- Claude Haiku 4.5 is 50% cheaper on input tokens ($1.00 vs $2.00 per 1M). Claude Haiku 4.5 is 50% cheaper on output tokens ($5.00 vs $10.00 per 1M). On our document Q&A workload (50,000 questions a month), Claude Haiku 4.5 costs $550.00 a month versus $1,100 for Claude Sonnet 5.5, 50% less.
- Which is more capable, Claude Haiku 4.5 or Claude Sonnet 5.5?
- Claude Sonnet 5.5 scores 164.4 on the Epoch Capabilities Index vs 142.4 for Claude Haiku 4.5.
- How much does Claude Haiku 4.5 cost per 1M tokens?
- Claude Haiku 4.5 costs $1.00 per 1M input tokens and $5.00 per 1M output tokens, and $0.10 per 1M cached input tokens on Anthropic’s standard tier.
- How much does Claude Sonnet 5.5 cost per 1M tokens?
- Claude Sonnet 5.5 costs $2.00 per 1M input tokens and $10.00 per 1M output tokens, and $0.20 per 1M cached input tokens on Anthropic’s standard tier.
- Which has the larger context window, Claude Haiku 4.5 or Claude Sonnet 5.5?
- Claude Sonnet 5.5 has the larger context window: 1M tokens versus 200K for Claude Haiku 4.5.