Claude Sonnet 5.5 vs GPT-6.1 Sol: integration & API costs
For an application integration, Sonnet 5.5 and GPT-6.1 Sol start with matching base input and output prices. The useful decision is how their documented interfaces and limits fit your workload.
Equal base prices need equal billing assumptions
The reviewed base rates are $2 input and $10 output per million text tokens for both models. Cache reads have their own rate and reasoning output is billable. Equal prices do not guarantee equal cost for the same text: tokenization, output length and request-tier conditions still matter.
Plan around the interface you will actually use
Sonnet's model ID is claude-sonnet-5-5 on Anthropic Messages; Sol's is gpt-6.1-sol on OpenAI Responses. The Developer view exposes verified feature support and keeps unverified fields explicit. An unknown capability here is a research gap, not proof that a provider lacks it.
Use a concrete acceptance test
Both document up to 128,000 output tokens, while their shared context windows differ. Before changing a coding or document workflow, compare required output formats, validation failures and task correctness on the same acceptance set. This page supplies cost and specification evidence, not an unsupported coding winner.
Documented specifications and standard direct API rates, manually checked 2026-10-09. Evaluation suggestions are editorial guidance; no measured comparative quality or speed is claimed.
Unknown fields are not evidence of equal capabilities. Specifications describe support, not comparative answer quality.
BENCHMARK EVIDENCE
No reliable data available
Comparable results with confirmed reuse permission have not been published here yet.
A published result must include the exact model version, benchmark version, original value and unit, test date, conditions and source. No scores or overall rankings are inferred.
Text tokens only. Billable output includes reasoning tokens where applicable. Excludes cache creation, tools, media and regional or processing-tier uplifts.
Default 30-minute cache writes use 1.25× uncached input pricing as a replacement rate. V1 live trials request explicit-only caching with no breakpoints.
KNOW YOUR API COST
A small prompt. A clearer budget.
Same token counts for both models. Standard paid text rates in USD. Output must include all billable reasoning tokens.
Cached input is included in total input. No cache creation/storage, tools, media, taxes or regional/priority/Batch fees. Tokenizers differ; equal token counts do not imply equal text length.
14 estimated credits / comparison14,000 credits across 1,000 comparisons.Reference estimate only. Playground uses verified OpenRouter charges; 1,000 credits = $1. A + B round up together once for each comparison.
See how your prompt behaves.
Choose an enabled official model pair in the Playground. Your maximum reservation is shown before running; confirmed usage determines the final charge.