o3 Pro vs InternVL 2.5 78B
Compare o3 Pro and InternVL 2.5 78B: 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 | o3 Pro | InternVL 2.5 78B |
|---|---|---|
| Category | Reasoning | Vision |
| Parameters | ~1T | 78B |
| Context Window | 200K | 128K |
| Input Price | $0.15/1M tokens | $0.05/1M tokens |
| Output Price | $0.60/1M tokens | $0.10/1M tokens |
| Latency | ~5000ms | ~400ms |
Choose o3 Pro when:
- ✓ Research-grade reasoning
- ✓ Mathematical proofs
- ✓ Hardest problems
Deepest reasoning, Best for hard problems, Highest accuracy
Choose InternVL 2.5 78B when:
- ✓ Document analysis
- ✓ Chart reading
- ✓ Visual Q&A
Strong visual reasoning, Open weights, Good OCR
Verdict: o3 Pro vs InternVL 2.5 78B
For cost efficiency, InternVL 2.5 78B wins at $0.05/1M input tokens. For speed, InternVL 2.5 78B is faster at ~400ms. o3 Pro excels at Research-grade reasoning while InternVL 2.5 78B is better for Document analysis. 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. InternVL 2.5 78B costs $0.05 input and $0.10 output. InternVL 2.5 78B is 3.0x 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. InternVL 2.5 78B offers 128K context at ~400ms. o3 Pro has the larger context window.
Best For
o3 Pro (Reasoning) is optimized for: Research-grade reasoning, Mathematical proofs, Hardest problems. InternVL 2.5 78B (Vision) works best for: Document analysis, Chart reading, Visual Q&A.
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 InternVL 2.5 78B
response_b = client.chat.completions.create(
model="internvl-2-5-78b",
messages=[{"role": "user", "content": "Your question here"}]
)Frequently Asked Questions
Which is better, o3 Pro or InternVL 2.5 78B?
o3 Pro (Reasoning, ~1T) offers Deepest reasoning. InternVL 2.5 78B (Vision, 78B) offers Strong visual reasoning. Choose o3 Pro for Research-grade reasoning or InternVL 2.5 78B for Document analysis.
How much does o3 Pro cost vs InternVL 2.5 78B?
o3 Pro: $0.15/1M input, $0.60/1M output. InternVL 2.5 78B: $0.05/1M input, $0.10/1M 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 InternVL 2.5 78B 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.