GPT-5.6 Sol vs Claude Opus 4.8
The head-to-head at the very top: each lab's premium tier on the hardest work.
Figures as of , read live from the model registry Zeplik bills against.
What the numbers say
- GPT-5.6 Sol is about 1.3x cheaper on output tokens (240 vs 300 credits per 1M).
- GPT-5.6 Sol is the newer release (July 2026 vs May 2026).
Derived from the live registry Zeplik routes and bills against. Credits: 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.
Side by side
GPT-5.6 Sol
OpenAI
GPT-5.6 Sol is the flagship model in OpenAI's GPT-5.6 series.
- Provider
- OpenAI
- Context window
- 1.1M tokens
- Input price
- 48.0 credits / 1M tokens ($4.00 raw)
- Output price
- 240 credits / 1M tokens ($20.00 raw)
- Vision (image input)
- Yes
- Tool calling
- Yes
- Extended reasoning
- No
Best for
- Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
- Very long documents and codebases: a 1.1M-token window fits entire books or repositories in one conversation
- Working with images: screenshots, charts, photos and scanned documents alongside text
- Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows
Claude Opus 4.8
Anthropic
Claude Opus 4.8 is Anthropic's most capable generally available model in the Opus family.
- Provider
- Anthropic
- Context window
- 1M tokens
- Input price
- 60.0 credits / 1M tokens ($5.00 raw)
- Output price
- 300 credits / 1M tokens ($25.00 raw)
- Vision (image input)
- Yes
- Tool calling
- Yes
- Extended reasoning
- No
Best for
- Hard problems where answer quality matters more than cost: strategy, analysis, difficult writing
- Very long documents and codebases: a 1M-token window fits entire books or repositories in one conversation
- Working with images: screenshots, charts, photos and scanned documents alongside text
- Tool use and agents: reliably calls functions, so it can search, run skills and drive workflows
Try both on Zeplik
The honest answer to most model debates is to run your own prompt on both. Zeplik puts GPT-5.6 Sol and Claude Opus 4.8 in the same chat, so you can switch mid-conversation and compare answers on the work you actually do.
Frequently asked questions
- What is the difference between GPT-5.6 Sol and Claude Opus 4.8?
- GPT-5.6 Sol is about 1.3x cheaper on output tokens (240 vs 300 credits per 1M). GPT-5.6 Sol is the newer release (July 2026 vs May 2026).
- Is GPT-5.6 Sol or Claude Opus 4.8 cheaper?
- GPT-5.6 Sol is cheaper: 240 credits per million output tokens against 300. 1 credit = $0.10, computed from the raw provider rate with a 1.20x margin.
- Which has the larger context window, GPT-5.6 Sol or Claude Opus 4.8?
- GPT-5.6 Sol, at 1.1M tokens against 1M.
- Can I use both GPT-5.6 Sol and Claude Opus 4.8 on Zeplik?
- Yes. Zeplik is a multi-model chat, so both sit behind one account and you can switch between them mid-conversation to compare answers on your own prompt.
- Do GPT-5.6 Sol and Claude Opus 4.8 need a paid plan?
- Both need a paid plan (Plus or above). Usage is then billed in credits from your monthly allowance.
Related comparisons
- GPT-6 Sol vs GPT-5.6 SolThe generational swap that also halves the bill: GPT-6 Sol replaces GPT-5.6 Sol at $2 in and $10 out, half what the model it supersedes now asks, on the same 1,050,000-token window.
- Claude Opus 4.8 vs Grok 4.5Anthropic's deepest model against xAI's flagship on frontier-difficulty work.
- GPT-6 Astra vs GPT-5.6 SolThe upgrade decision almost every OpenAI user is actually making: GPT-6 Astra costs two and a half times GPT-5.6 Sol per token for the same 1,050,000-token window, so the question is which work is hard enough to need it.
- Claude Opus 4.8 vs Gemini 3.1 Pro PreviewPremium-tier depth against premium-tier context: Opus quality versus Gemini scale.
- GPT-5.6 Sol vs Claude Sonnet 5The two defaults most people actually choose between: OpenAI's mainstream flagship against Anthropic's balanced current generation.
- Claude Sonnet 5 vs Claude Opus 4.8Sonnet's balance against Opus depth, the classic Anthropic tier decision.
Explore Zeplik
- 468 AI skillsReady-to-run expert methods that run on GPT-5.6 Sol, Claude Opus 4.8 or any other model.
- 997 integrationsConnect Gmail, Slack, GitHub, Notion and hundreds more so the assistant can work in your apps.
- Simple pricingPlus, Pro and Max plans with a monthly credit allowance that works across every model.