GPT-5.6 Sol vs GPT-6.1 Sol: API cost comparison
For a typical chatbot (1,500 input + 400 output tokens, 100,000 requests a month), GPT-6.1 Sol is 50% cheaper: $700 vs $1,400 for GPT-5.6 Sol. Paste your own prompt below to compare the exact cost of your workload.
0 characters0 words0 tokens (GPT o200k)
| Model | Per month |
|---|---|
| GPT-6.1 Sol | |
| GPT-5.6 Sol |
≈ = estimated token count: only OpenAI publishes its tokenizer. Claude counts use Anthropic’s published ratios; use the count_tokens API for an exact number.
Price per million tokens
USD, standard tier. Prices checked on October 28, 2026.
| GPT-5.6 Sol | GPT-6.1 Sol | |
|---|---|---|
| Input | $4 | $2 |
| Output | $20 | $10 |
| Cached input | $0.4 | $0.1 |
| Cache write (5 min) | Not charged separately | Not charged separately |
| Long prompts | Above 272K tokens: $8 / $30 | Above 272K tokens: $4 / $15 |
| Batch API | 50% off | 50% off |
| Provider | OpenAI (GPT) | OpenAI (GPT) |
GPT-5.6 Sol: Promotional price, available at least through November 21, 2026.
Monthly cost for common workloads
| Workload | GPT-5.6 Sol | GPT-6.1 Sol |
|---|---|---|
| Chatbot 1,500 input + 400 output tokens, 100,000 requests a month | $1,400 | $700 |
| Document Q&A (RAG) 8,000 input + 500 output tokens, half the input cached, 20,000 requests a month | $552 | $268 |
| Long-document summary 150,000 input + 2,000 output tokens, 1,000 requests a month | $640 | $320 |
| Bulk classification (Batch API) 500 input + 20 output tokens, 1 million requests a month, Batch API where available | $1,200 | $600 |
Token counts are converted per model: the same text becomes a different number of tokens on each provider (see below). The cheaper option in each row is highlighted.
Frequently asked questions
Is GPT-5.6 Sol cheaper than GPT-6.1 Sol?
Per million tokens, GPT-5.6 Sol costs $4 / $20 (input / output) and GPT-6.1 Sol costs $2 / $10. For a typical chatbot workload (1,500 input + 400 output tokens, 100,000 requests a month), GPT-6.1 Sol is 50% cheaper: $700 vs $1,400 for GPT-5.6 Sol. Token counts differ between providers, so compare the cost of the same prompt rather than the price per token.
How much do GPT-5.6 Sol and GPT-6.1 Sol cost per million tokens?
GPT-5.6 Sol: $4 / $20 for input / output, $0.4 for cached input. GPT-6.1 Sol: $2 / $10, $0.1 for cached input. Prices in US dollars, standard tier, checked on October 28, 2026.
Do GPT-5.6 Sol and GPT-6.1 Sol count tokens the same way?
GPT-5.6 Sol's tokenizer is not published; we use the o200k count, which is close for newer OpenAI models. GPT-6.1 Sol's tokenizer is not published; we use the o200k count, which is close for newer OpenAI models.
Do GPT-5.6 Sol and GPT-6.1 Sol have a Batch API discount?
Both do: GPT-5.6 Sol gets 50% off and GPT-6.1 Sol 50% off for requests sent through the Batch API, which may take up to 24 hours.
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