Which is more cost-effective, Claude Sonnet 5 or Claude Haiku 4.5?

Based on 1M input + 1M output tokens, Claude Sonnet 5 costs $12.00/month versus Claude Haiku 4.5 at $6.00/month. The cheaper option depends on your token volume and prompt-to-completion ratio. Use the interactive calculator on this page to enter your exact usage.

How accurate is this cost comparison?

List prices come from each provider's own pricing page and every model page shows when they were last verified. The capability scores are iOPTERA's editorial composites — informed by public benchmarks, not benchmark results themselves; the methodology page explains how they are set.

Which model scores higher on benchmarks?

Claude Sonnet 5 scores 95 in coding and 92 in reasoning benchmarks. Claude Haiku 4.5 scores 83 in coding and 82 in reasoning. See the full 5-category breakdown in the Benchmark Comparison section above.

What are the context window sizes of Claude Sonnet 5 and Claude Haiku 4.5?

Claude Sonnet 5 supports a 1.0M-token context window while Claude Haiku 4.5 supports 200K tokens. A larger context window lets you process more text in a single API call.

Which model is faster for real-time applications?

Claude Sonnet 5 has a speed score of 88/100 and Claude Haiku 4.5 scores 97/100 on our latency benchmark. For interactive chatbots and low-latency tasks, the higher speed score is preferable.

Can I calculate costs for my specific token volume?

Yes. Use the interactive cost calculator on this page. Enter your monthly token volume and adjust the prompt-to-completion ratio. You can also use presets for common scenarios like Customer Support Bots (~30M tokens/month) or Document Summarizers (~15M tokens/month).

Cost and performance comparison

Claude Sonnet 5 vs Claude Haiku 4.5

Model AAnthropic

Claude Sonnet 5

Capability score (editorial)92/100

Cost / 1M Tokens: $4.40; 70% in · 30% out mix; ≈ $6.29 for the same text, tokenizer included
Value Index (score÷cost): 14.6; Higher = better value

Speed: 88/100
Context: 1.0M
Tier: Smart Tier

List price from the Anthropic pricing page, verified October 12, 2026.

Its tokenizer produces about 43% more tokens than OpenAI's for the same text, so the real cost runs higher than the list price suggests. This is an estimate: the tokenizer has not been measured yet.

Check the source

How we verify prices

Model BAnthropic

Claude Haiku 4.5

Capability score (editorial)82/100

Cost / 1M Tokens: $2.20; 70% in · 30% out mix; ≈ $2.42 for the same text, tokenizer included
Value Index (score÷cost): 33.9; Higher = better value

Speed: 97/100
Context: 200K
Tier: Fast Tier

List price from the Anthropic pricing page, verified October 12, 2026.

Its tokenizer produces about 10% more tokens than OpenAI's for the same text, so the real cost runs higher than the list price suggests. This is an estimate: the tokenizer has not been measured yet.

Check the source

How we verify prices

In-depth analysis

Claude Sonnet 5 vs Claude Haiku 4.5: Detailed Comparison

Claude Sonnet 5 is Anthropic's mid-range-tier language model with a 1.0M-token context window, excelling at coding. Claude Haiku 4.5 from Anthropic is a lightweight-tier model supporting 200K tokens in context, with standout performance in data extraction.

Claude Sonnet 5 costs 2.6x what Claude Haiku 4.5 does for the same text. That is a steep premium, and it buys a 22-point lead on combined coding and reasoning. Whether that trade is worth it depends entirely on how much of your traffic actually needs the harder model — for most workloads the honest answer is a small fraction of it, which is an argument for routing rather than for picking one. Claude Sonnet 5 is priced at $2.00/M input tokens and $10.00/M output tokens. Claude Haiku 4.5 costs $1.00/M input and $5.00/M output.

Claude Sonnet 5 turns the same text into about 30% more tokens than Claude Haiku 4.5, because their tokenizers differ — so comparing list prices per token understates what Claude Sonnet 5 costs. For the same text, split 70% input and 30% output and counted the way OpenAI's tokenizer counts it, Claude Sonnet 5 works out at about $6.29 per million tokens and Claude Haiku 4.5 at $2.42. Every cost figure on this page includes that difference.

On iOPTERA's editorial scores, Claude Sonnet 5 leads with 95/100 for coding and 92/100 for reasoning, against Claude Haiku 4.5's 83/100 and 82/100.

Capability breakdown

Across the five core benchmark categories, here is how Claude Sonnet 5 and Claude Haiku 4.5 stack up head to head:

coding

Claude Sonnet leads

reasoning

Claude Sonnet leads

data extraction

Claude Sonnet leads

creative tasks

Claude Sonnet leads

vision/multimodal

Claude Sonnet leads

Best model by task

coding: Claude Sonnet 5 wins with 95/100
reasoning: Claude Sonnet 5 wins with 92/100
data extraction: Claude Sonnet 5 wins with 92/100
creative tasks: Claude Sonnet 5 wins with 91/100
vision/multimodal: Claude Sonnet 5 wins with 90/100

Estimated monthly cost at scale

For 10M + 2M tokens of text a month (counted the way OpenAI's tokenizer counts), Claude Sonnet 5 runs about $57.20 while Claude Haiku 4.5 runs about $22.00 — Claude Haiku 4.5 saves roughly $35.20 (62%) every month.

What actually decides it

Both models come from Anthropic, so they share a tokenizer, an API surface, and a billing account. Switching between them is a model-string change and nothing else — no new SDK, no re-tokenizing your prompts to re-estimate cost, no second vendor to onboard. That makes routing between them far cheaper to implement than a cross-vendor split.

Claude Sonnet 5 and Claude Haiku 4.5 were released within 8 months of each other, so they are competing on the same evaluations under roughly the same conditions. That makes a direct benchmark comparison meaningful here in a way it usually is not — neither model has the advantage of being measured on a newer, easier set of tests.

The context gap is the largest single difference on this pair: Claude Sonnet 5 takes 1.0M tokens against 200K for Claude Haiku 4.5, roughly 5.0x. That is the difference between feeding in a whole repository or a full contract set and having to chunk it. If your work involves documents you cannot split cleanly, this decides it on its own.

Throughput is close enough to ignore — 97/100 versus 88/100. Neither model will feel noticeably quicker in an interactive product, so latency is not a reason to choose between them.

Claude Sonnet 5 is 2.6x the price of Claude Haiku 4.5. Reserve it for the requests that actually need it and route the rest to Claude Haiku 4.5 — that hybrid beats either model used alone on cost per useful answer.

What you actually pay

The list price is only the start. Prompt caching, batch processing and long prompts change the bill, and each provider sets them differently. Prices per 1M tokens.

Pricing terms beyond the list price, per 1M tokens
Pricing term	Claude Sonnet 5	Claude Haiku 4.5
List price (input / output)	$2.00 / $10.00	$1.00 / $5.00
Cached input	$0.2010% of the input price	$0.1010% of the input price
Batch API	50% off input and output	50% off input and output
Long prompts	No surcharge across the 1M window	No surcharge across the 200K window
Input with 80% cache hits	$0.56	$0.28

With 80% of input served from the cache, Claude Haiku 4.5 costs 62% less than Claude Sonnet 5 for the same input text, counting each model's tokenizer.The tokenizer factor for Claude Sonnet 5, Claude Haiku 4.5 is our estimate until it is measured.

The last row assumes 80% of input tokens are read from the cache, as in a chat app that re-sends a long system prompt or RAG over the same documents. Cache-write and storage charges are not included.

Claude also bills cache writes: 1.25× the input price for a 5-minute cache, 2× for one hour.

Checked on October 8, 2026 against the pricing pages of Anthropic.

Capability scores

iOPTERA editorial scores across 5 categories — informed by public benchmarks, not measured by us

CategoryClaude SonnetClaude HaikuWinner

Coding

Reasoning

Extraction

Creative

Vision

Claude Sonnet 5: 5 wins

Claude Haiku 4.5: 0 wins

Claude Sonnet 5 leads overall

Speed Score

88/100vs97/100

ClaudeClaude

Context Window

1000Kvs200K

ClaudeClaude

What Is a Token?

Models don't read words — they process tokens.

A token is roughly 4 characters of English text (~¾ of a word). Your API bill is priced per million tokens — understanding this directly reduces your costs.

Short phrase

"Hello, world!"

4 tokens

Claude Sonnet 5: $1.14
Claude Haiku 4.5: $0.44

Business email

One typical email (~200 words)

~270 tokens

Claude Sonnet 5: $77.22
Claude Haiku 4.5: $29.70

Code file

50-line Python script

~400 tokens

Claude Sonnet 5: $114.40
Claude Haiku 4.5: $44.00

Prices shown are for 100,000 runs of each workload — one run costs a fraction of a cent on both Claude Sonnet 5 and Claude Haiku 4.5, so the number only becomes meaningful at production volume. Input tokens only; add your output volume in the calculator below.

How to check your token usage

response.usage.total_tokens

Every API response includes a usage object. Sum total_tokens across all calls to get your monthly figure, then use the calculator below.

Your Cost Calculator

Enter your actual monthly token usage to see real savings

Quick Presets

Monthly Token Volume

30M tokens

Prompt / Completion Split

Prompt 70%Completion 30%

Claude Sonnet 5

$188.76/mo

$2,265.12/yr

$2.00/M input$10.00/M output

Cheaper

Claude Haiku 4.5

$72.60/mo

$871.20/yr

$1.00/M input$5.00/M output

Annual Savings

$1,393.92 saved per year

Claude Haiku 4.5 cheaper · $116.16/mo

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