InternLM 2.5 20B vs Solar Pro
Compare InternLM 2.5 20B and Solar 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 | InternLM 2.5 20B | Solar Pro |
|---|---|---|
| Category | Open Source | Open Source |
| Parameters | 20B | 22B |
| Context Window | 256K | 32K |
| Input Price | $0.02/1M tokens | $0.02/1M tokens |
| Output Price | $0.04/1M tokens | $0.04/1M tokens |
| Latency | ~180ms | ~180ms |
Choose InternLM 2.5 20B when:
- ✓ Long context tasks
- ✓ Research
- ✓ Multilingual
256K context, Strong reasoning, Good multilingual
Choose Solar Pro when:
- ✓ General purpose
- ✓ Korean content
- ✓ Chatbots
Good instruction following, Compact, Efficient
Verdict: InternLM 2.5 20B vs Solar Pro
For cost efficiency, Solar Pro wins at $0.02/1M input tokens. For speed, Solar Pro is faster at ~180ms. InternLM 2.5 20B excels at Long context tasks while Solar Pro is better for General purpose. Both are available on XALEN through a single API — try them in the Playground to see which fits your workload.
Detailed Analysis
Pricing Comparison
InternLM 2.5 20B costs $0.02/1M input tokens and $0.04/1M output tokens. Solar Pro costs $0.02 input and $0.04 output. Both models are similarly priced. XALEN offers batch processing at 50% discount on both models.
Performance & Context
InternLM 2.5 20B has a 256K context window with ~180ms latency. Solar Pro offers 32K context at ~180ms. InternLM 2.5 20B has the larger context window.
Best For
InternLM 2.5 20B (Open Source) is optimized for: Long context tasks, Research, Multilingual. Solar Pro (Open Source) works best for: General purpose, Korean content, Chatbots.
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 InternLM 2.5 20B
response_a = client.chat.completions.create(
model="internlm-2-5-20b",
messages=[{"role": "user", "content": "Your question here"}]
)
# Use Solar Pro
response_b = client.chat.completions.create(
model="solar-pro",
messages=[{"role": "user", "content": "Your question here"}]
)Frequently Asked Questions
Which is better, InternLM 2.5 20B or Solar Pro?
InternLM 2.5 20B (Open Source, 20B) offers 256K context. Solar Pro (Open Source, 22B) offers Good instruction following. Choose InternLM 2.5 20B for Long context tasks or Solar Pro for General purpose.
How much does InternLM 2.5 20B cost vs Solar Pro?
InternLM 2.5 20B: $0.02/1M input, $0.04/1M output. Solar Pro: $0.02/1M input, $0.04/1M 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 InternLM 2.5 20B and Solar Pro 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.