o3 Pro vs Dolphin 2.9.3 72B

Compare o3 Pro and Dolphin 2.9.3 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

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Feature o3 Pro Dolphin 2.9.3 72B
CategoryReasoningOpen Source
Parameters~1T72B
Context Window200K128K
Input Price$0.15/1M tokens$0.04/1M tokens
Output Price$0.60/1M tokens$0.08/1M tokens
Latency~5000ms~350ms

Choose o3 Pro when:

  • ✓ Research-grade reasoning
  • ✓ Mathematical proofs
  • ✓ Hardest problems
Key Strengths:

Deepest reasoning, Best for hard problems, Highest accuracy

Choose Dolphin 2.9.3 72B when:

  • ✓ Creative writing
  • ✓ Unrestricted generation
  • ✓ Research
Key Strengths:

Uncensored, Strong instruction following, Versatile

Verdict: o3 Pro vs Dolphin 2.9.3 72B

For cost efficiency, Dolphin 2.9.3 72B wins at $0.04/1M input tokens. For speed, Dolphin 2.9.3 72B is faster at ~350ms. o3 Pro excels at Research-grade reasoning while Dolphin 2.9.3 72B is better for Creative writing. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.

Detailed Analysis

Pricing Comparison

o3 Pro costs $0.15/1M input tokens and $0.60/1M output tokens. Dolphin 2.9.3 72B costs $0.04 input and $0.08 output. Dolphin 2.9.3 72B is 3.8x cheaper on input tokens. XALEN offers batch processing at 50% discount on both models.

Performance & Context

o3 Pro has a 200K context window with ~5000ms latency. Dolphin 2.9.3 72B offers 128K context at ~350ms. o3 Pro has the larger context window.

Best For

o3 Pro (Reasoning) is optimized for: Research-grade reasoning, Mathematical proofs, Hardest problems. Dolphin 2.9.3 72B (Open Source) works best for: Creative writing, Unrestricted generation, 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 o3 Pro
response_a = client.chat.completions.create(
    model="o3-pro",
    messages=[{"role": "user", "content": "Your question here"}]
)

# Use Dolphin 2.9.3 72B
response_b = client.chat.completions.create(
    model="dolphin-2-9-3-72b",
    messages=[{"role": "user", "content": "Your question here"}]
)

Start Building with XALEN

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Get API Key Try in Playground

Frequently Asked Questions

Which is better, o3 Pro or Dolphin 2.9.3 72B?

o3 Pro (Reasoning, ~1T) offers Deepest reasoning. Dolphin 2.9.3 72B (Open Source, 72B) offers Uncensored. Choose o3 Pro for Research-grade reasoning or Dolphin 2.9.3 72B for Creative writing.

How much does o3 Pro cost vs Dolphin 2.9.3 72B?

o3 Pro: $0.15/1M input, $0.60/1M output. Dolphin 2.9.3 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 o3 Pro and Dolphin 2.9.3 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.