Claude Haiku 3.5 vs o3 Pro
Compare Claude Haiku 3.5 and o3 Pro: pricing, performance, context window, latency, and best use cases. Side-by-side comparison on XALEN.
Updated 2026-05-21 · By Abhishek Raj · Our methodology
| Feature | Claude Haiku 3.5 | o3 Pro |
|---|---|---|
| Category | Compact | Reasoning |
| Parameters | ~20B | ~1T |
| Context Window | 200K | 200K |
| Input Price | $0.008/1M tokens | $0.15/1M tokens |
| Output Price | $0.04/1M tokens | $0.60/1M tokens |
| Latency | ~150ms | ~5000ms |
Choose Claude Haiku 3.5 when:
- ✓ High-volume APIs
- ✓ Fast chatbots
- ✓ Content moderation
Very fast, Low cost, 200K context
Choose o3 Pro when:
- ✓ Research-grade reasoning
- ✓ Mathematical proofs
- ✓ Hardest problems
Deepest reasoning, Best for hard problems, Highest accuracy
Verdict: Claude Haiku 3.5 vs o3 Pro
For cost efficiency, Claude Haiku 3.5 wins at $0.008/1M input tokens. For speed, Claude Haiku 3.5 is faster at ~150ms. Claude Haiku 3.5 excels at High-volume APIs while o3 Pro is better for Research-grade reasoning. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.
Detailed Analysis
Pricing Comparison
Claude Haiku 3.5 costs $0.008/1M input tokens and $0.04/1M output tokens. o3 Pro costs $0.15 input and $0.60 output. Claude Haiku 3.5 is 18.8x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.
Performance & Context
Claude Haiku 3.5 has a 200K context window with ~150ms latency. o3 Pro offers 200K context at ~5000ms. Both have identical context windows.
Best For
Claude Haiku 3.5 (Compact) is optimized for: High-volume APIs, Fast chatbots, Content moderation. o3 Pro (Reasoning) works best for: Research-grade reasoning, Mathematical proofs, Hardest problems.
Try Both on XALEN
Both models are available through XALEN's OpenAI-compatible API. Switch between them by changing the model parameter:
from xalen import XALEN
client = XALEN(api_key="xln_test_YOUR_KEY")
# Use Claude Haiku 3.5
response_a = client.chat.completions.create(
model="claude-haiku-3-5",
messages=[{"role": "user", "content": "Your question here"}]
)
# Use o3 Pro
response_b = client.chat.completions.create(
model="o3-pro",
messages=[{"role": "user", "content": "Your question here"}]
)Frequently Asked Questions
Which is better, Claude Haiku 3.5 or o3 Pro?
Claude Haiku 3.5 (Compact, ~20B) offers Very fast. o3 Pro (Reasoning, ~1T) offers Deepest reasoning. Choose Claude Haiku 3.5 for High-volume APIs or o3 Pro for Research-grade reasoning.
How much does Claude Haiku 3.5 cost vs o3 Pro?
Claude Haiku 3.5: $0.008/1M input, $0.04/1M output. o3 Pro: $0.15/1M input, $0.60/1M output. Both available on XALEN with batch processing at 50% discount.
Can I use both models on XALEN?
Yes. XALEN provides 200+ models through a single OpenAI-compatible API. Switch between Claude Haiku 3.5 and o3 Pro by changing the model parameter. No code changes needed.
Related Comparisons
Last updated: 2026-05-21. Pricing and specifications may change. Check pricing page for latest rates.