Claude Haiku 4.5 is Anthropic’s fastest and most efficient model, delivering near-frontier intelligence at a fraction of the cost and latency of larger Claude models. Matching Claude Sonnet 4’s performance...
Model details →Anthropic: Claude Haiku 4.5 (batch) vs OpenAI: GPT-5.1
Anthropic: Claude Haiku 4.5 (batch) wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
GPT-5.1 is the latest frontier-grade model in the GPT-5 series, offering stronger general-purpose reasoning, improved instruction adherence, and a more natural conversational style compared to GPT-5. It uses adaptive reasoning...
Model details →Side-by-side comparison
| Capability | Anthropic: Claude Haiku 4.5 (batch) | OpenAI: GPT-5.1 | Winner |
|---|---|---|---|
| Context window Maximum number of input tokens the model can attend to in a single request. | 200K | 400K | 🏆 OpenAI: GPT-5.1 |
| Input price (per 1M) Cost per million input tokens billed by the provider. | $0.50 | $1.25 | 🏆 Anthropic: Claude Haiku 4.5 (batch) |
| Output price (per 1M) Cost per million output tokens billed by the provider. | $2.50 | $10.00 | 🏆 Anthropic: Claude Haiku 4.5 (batch) |
| Tool / function calling First-class support for emitting structured tool calls. | Yes | Yes | Tie |
| Vision input Accepts image inputs alongside text. | Yes | Yes | Tie |
| Reasoning mode Internal chain-of-thought / extended-thinking support. | Yes | Yes | Tie |
Frequently asked questions
Is Anthropic: Claude Haiku 4.5 (batch) better than OpenAI: GPT-5.1?
Anthropic: Claude Haiku 4.5 (batch) wins on 2 of 6 axes — pricing and capability skew in its favour for most workloads.
What's the price difference between Anthropic: Claude Haiku 4.5 (batch) and OpenAI: GPT-5.1?
Input: $0.50 vs $1.25 per 1M tokens. Output: $2.50 vs $10.00 per 1M tokens.
What context windows do Anthropic: Claude Haiku 4.5 (batch) and OpenAI: GPT-5.1 support?
Anthropic: Claude Haiku 4.5 (batch) supports up to 200K tokens. OpenAI: GPT-5.1 supports up to 400K tokens.
Do both Anthropic: Claude Haiku 4.5 (batch) and OpenAI: GPT-5.1 support tool calling?
Anthropic: Claude Haiku 4.5 (batch): yes. OpenAI: GPT-5.1: yes.
Compare Anthropic: Claude Haiku 4.5 (batch) with other models
vs Anthropic Claude Haiku Latestvs Anthropic Claude Sonnet Latestvs Anthropic: Claude Fable Latestvs Anthropic: Claude Opus Latest