Claude Sonnet 4.5 vs Molmo 72B
Compare Claude Sonnet 4.5 and Molmo 72B: 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 Sonnet 4.5 | Molmo 72B |
|---|---|---|
| Category | Frontier | Vision |
| Parameters | ~600B | 72B |
| Context Window | 200K | 128K |
| Input Price | $0.03/1M tokens | $0.04/1M tokens |
| Output Price | $0.15/1M tokens | $0.08/1M tokens |
| Latency | ~350ms | ~350ms |
Choose Claude Sonnet 4.5 when:
- ✓ Code generation
- ✓ Structured output
- ✓ Automation
Strong coding, Better instruction following, Reliable
Choose Molmo 72B when:
- ✓ Visual grounding
- ✓ Object detection
- ✓ Research
Fully open, Good pointing/grounding, Transparent
Verdict: Claude Sonnet 4.5 vs Molmo 72B
For cost efficiency, Claude Sonnet 4.5 wins at $0.03/1M input tokens. For speed, Molmo 72B is faster at ~350ms. Claude Sonnet 4.5 excels at Code generation while Molmo 72B is better for Visual grounding. 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 Sonnet 4.5 costs $0.03/1M input tokens and $0.15/1M output tokens. Molmo 72B costs $0.04 input and $0.08 output. Claude Sonnet 4.5 is 1.3x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.
Performance & Context
Claude Sonnet 4.5 has a 200K context window with ~350ms latency. Molmo 72B offers 128K context at ~350ms. Claude Sonnet 4.5 has the larger context window.
Best For
Claude Sonnet 4.5 (Frontier) is optimized for: Code generation, Structured output, Automation. Molmo 72B (Vision) works best for: Visual grounding, Object detection, Research.
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 Sonnet 4.5
response_a = client.chat.completions.create(
model="claude-sonnet-4-5",
messages=[{"role": "user", "content": "Your question here"}]
)
# Use Molmo 72B
response_b = client.chat.completions.create(
model="molmo-72b",
messages=[{"role": "user", "content": "Your question here"}]
)Frequently Asked Questions
Which is better, Claude Sonnet 4.5 or Molmo 72B?
Claude Sonnet 4.5 (Frontier, ~600B) offers Strong coding. Molmo 72B (Vision, 72B) offers Fully open. Choose Claude Sonnet 4.5 for Code generation or Molmo 72B for Visual grounding.
How much does Claude Sonnet 4.5 cost vs Molmo 72B?
Claude Sonnet 4.5: $0.03/1M input, $0.15/1M output. Molmo 72B: $0.04/1M input, $0.08/1M 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 Sonnet 4.5 and Molmo 72B by changing the model parameter. No code changes needed.
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Last updated: 2026-05-21. Pricing and specifications may change. Check pricing page for latest rates.