gpt-5.6-sol vs Claude Opus 5
The two frontier models most often shortlisted against each other for work where quality matters more than cost.
Prices in USD per 1M tokens, standard tier, updated 2026-09-25.
gpt-5.6-sol
- Input / 1M
- $4.00
- Cached input / 1M
- $0.400
- Output / 1M
- $20.00
- Context window
- 1.1M
- Source
- First-party
Claude Opus 5
- Input / 1M
- $5.00
- Cached input / 1M
- $0.500
- Output / 1M
- $25.00
- Context window
- 1M
- Source
- First-party
Which is cheaper depends on the workload
Estimated monthly cost for three common request shapes. This is the part a price list cannot answer.
| Workload | gpt-5.6-sol | Claude Opus 5 | Cheaper |
|---|---|---|---|
| Chat assistant1,500 in / 600 out × 100,000/mo | $1.8K | $2.3K | gpt-5.6-sol · 1.3× cheaper |
| RAG / document Q&A20,000 in / 500 out × 30,000/mo | $2.7K | $3.4K | gpt-5.6-sol · 1.3× cheaper |
| Coding agent30,000 in / 4,000 out × 20,000/mo | $4.0K | $5.0K | gpt-5.6-sol · 1.3× cheaper |
Excludes caching discounts, so real bills with repeated prompts are lower. Price your own workload →
Common questions
- Is gpt-5.6-sol or Claude Opus 5 cheaper?
- It depends on the shape of your requests. gpt-5.6-sol has the lower input price ($4.00 per 1M). gpt-5.6-sol has the lower output price ($20.00 per 1M). Because output usually costs several times more than input, the cheaper choice flips depending on how much text you generate.
- What is the context window on gpt-5.6-sol and Claude Opus 5?
- gpt-5.6-sol accepts 1,050,000 tokens and Claude Opus 5 accepts 1,000,000 tokens. gpt-5.6-sol holds more.
- Do these prices include caching discounts?
- The table shows standard rates. gpt-5.6-sol bills cached input at $0.400 per 1M and Claude Opus 5 at $0.500. If you resend the same system prompt or document, that discount usually matters more than the headline difference.