Claude Haiku 4.5 vs GPT-4o
Claude Haiku 4.5 is cheaper for every workload modelled here.
List prices checked
Specifications and rates
| Property | Claude Haiku 4.5 | GPT-4o |
|---|---|---|
| Input per 1M | $1.00 | $2.50 |
| Output per 1M | $5.00 | $10.00 |
| Cached input per 1M | $0.100 | $1.25 |
| Blended (3:1) | $2.00 | $4.38 |
| Context window | 200K | 128K |
| Max output | 64K | 16K |
| Inputs accepted | text, image | text, image, audio |
Source: Anthropic pricing (August 2026) · OpenAI pricing (May 2026). Published list prices only — committed-use discounts, regional variation, and per-request charges are not included. Not yet independently re-checked against the vendor’s page.
Monthly cost by workload
Identical token volumes through both rate cards. Output-heavy profiles are where the ranking flips.
| Workload | Claude Haiku 4.5 | GPT-4o | Cheaper |
|---|---|---|---|
| In-app chat assistantA support or help assistant handling a few thousand conversations a month, with short prompts and short answers. | $45 | $100 | Claude Haiku 4.5saves $55/mo (55%) |
| RAG over documentsRetrieval-augmented answering where each request stuffs several retrieved passages into the prompt, so input dominates. | $375 | $900 | Claude Haiku 4.5saves $525/mo (58%) |
| Coding agentAn agentic loop that reads files and writes patches, generating heavy output and re-sending large context on every turn. | $900 | $2,000 | Claude Haiku 4.5saves $1,100/mo (55%) |
What each one is for
Claude Haiku 4.5
by Anthropic
The fast, cheap end of the Claude family, priced at a third of Sonnet while keeping the same context window. Suited to classification, extraction, and high-volume routing.
GPT-4o
by OpenAI
The natively multimodal model that set the mid-market price for over a year. Now more expensive than newer models that outperform it, but still the default in a great deal of shipped code.
Common questions
- Is Claude Haiku 4.5 or GPT-4o cheaper in 2026?
- Claude Haiku 4.5, for every workload modelled here. On a blended 3:1 basis it costs $2.00 per million tokens against GPT-4o's $4.38.
- Which has the larger context window?
- Claude Haiku 4.5, at 200K tokens against 128K. A larger window only helps if you can afford to fill it — the cost of one full-context request is in the table above.
- Which is cheaper for output-heavy work like agents?
- Claude Haiku 4.5, at $5.00 per million output tokens against $10.00. Reasoning tokens bill as output, so for agentic loops this axis usually decides the invoice regardless of what the input rates look like.
- What is not included in these figures?
- Batch-processing discounts, fine-tuning, long-context surcharges above a provider's standard tier, and any enterprise agreement. These are published pay-as-you-go list prices, checked against each provider's own pricing page on the date shown.
- Is switching from GPT-4o to Claude Haiku 4.5 worth it?
- On price alone it is about 54% cheaper on a blended basis. Whether that survives contact with your workload depends on output quality and on retry rate — a cheaper model that needs two attempts is not cheaper. Model the specific volumes in the calculator before you migrate.