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claude-sonnet-5vsgpt-6-solBoth are available on APICLAN through one OpenAI-compatible endpoint, so switching between them is a one-word change. Here is what each actually costs you, and how much the difference is worth at your volume.
gpt-6-sol runs about
0% cheaper than claude-sonnet-5. Both models are from
different families.Percentages are easy to shrug off. Put your real monthly volume in and see the number in dollars.
Both models list at $2.00 input and $10.00 output per million tokens, and both charge $0.20 per million for cached input. On short requests the two bills are the same to the cent.
They diverge above 272,000 input tokens. gpt-6-sol reprices the entire request
at that point — $4.00 input and $15.00 output. Claude models from 4.6 onward include
the full million-token context at standard price, with no long-context tier at all.
What that means on a 300,000-token prompt returning 2,000 tokens, at list:
gpt-6-sol: 300,000 × $4 + 2,000 × $15 — $1.23claude-sonnet-5: 300,000 × $2 + 2,000 × $10 — $0.62Same headline price, twice the bill. Under the threshold the comparison flips back to a tie, so the deciding question is not which model is cheaper — it is whether your prompts cross 272k.
One more practical difference: cache writes. Sol charges $2.50 per million to write. Sonnet 5 charges $2.50 for the 5-minute cache and $4.00 for the 1-hour cache, so a loop that reuses a prefix over a long session can buy a longer-lived cache; one that fires in bursts should stay on the short one.
We do not publish capability benchmarks, and you should be sceptical of anyone who does. Scores on public benchmarks rarely predict how a model behaves on your codebase, your prompts and your edge cases.
What we can tell you is exactly what each one costs. Run both against a real task from your own workload — switching takes one word — and let the cheaper one win unless it visibly fails.
A practical approach that works well in agent loops: route the bulk of calls to the cheaper model, and escalate to the more expensive one only when the first attempt fails a check. Most workloads are dominated by routine calls, so the blended cost lands close to the cheap model rather than the expensive one.
Same endpoint, same key, same request shape. Only the model string changes.
- model="claude-sonnet-5",
+ model="gpt-6-sol",If you have not connected yet, the quickstart takes about thirty seconds — you change your base URL and nothing else.
Prices verified 2026-09-25 and regenerated automatically from live billing data. List prices change; this page follows them.