ModelRefs / Claude 3.5 Haiku vs o3 Pro
Claude 3.5 Haiku vs o3 Pro
Claude 3.5 Haiku vs o3 Pro: side-by-side benchmarks, pricing, context windows, coding ability and deployment. Pick the right model for your stack.
Overview
Claude 3.5 Haiku: Claude 3.5 Haiku is Anthropic's fast, low-cost model from late 2024, built for high-volume work such as classification, extraction and routing across a 200,000-token context window. The claude-3-5-haiku-20241022 snapshot was deprecated on 19 December 2025 and retired on Anthropic-operated platforms on 19 February 2026, with Claude Haiku 4.5 named as its replacement.
o3 Pro: o3 Pro is OpenAI's highest-capability reasoning model, applying extended compute at inference time to solve complex scientific, mathematical, and programming problems. It achieved the highest published scores on ARC-AGI-2 and competitive programming benchmarks at its June 2025 release.
Context window: Claude 3.5 Haiku accepts up to 200,000 tokens, o3 Pro up to 200,000. Confirm the limit for your specific deployment channel before relying on it.
Claude 3.5 Haiku vs o3 Pro at a glance
| Attribute | Claude 3.5 Haiku | o3 Pro |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Released | 2024-11-04 | 2025-06-10 |
| Context window | 200,000 tokens | 200,000 tokens |
| Input price | $0.8/M tokens | $20/M tokens |
| Output price | $4/M tokens | $80/M tokens |
| Licence | Proprietary | Proprietary |
| Self-hostable | No, hosted only | No, hosted only |
| Modalities | text | text, vision |
Where they differ most
- Reasoning: Claude 3.5 Haiku 25%, o3 Pro 32%. o3 Pro leads on this dimension.
Capability scores are ModelRefs' own derived signals, not vendor claims or benchmark results. Validate against your own workload before relying on them.
Continue your research
Use these connected ModelRefs sections to compare alternatives, inspect implementation paths, and review the evidence and governance boundaries relevant to Claude 3.5 Haiku vs o3 Pro.
Frequently asked questions
Which is better, Claude 3.5 Haiku or o3 Pro?
Claude 3.5 Haiku and o3 Pro target different workloads — see the benchmark and pricing tables for a side-by-side answer.
Is Claude 3.5 Haiku cheaper than o3 Pro?
Compare $0.00080 vs $0.0200 on this page.