Claude Sonnet 5.5
Batch API: input $1.00 and output $5.00 per 1M tokens.
Claude Sonnet 5.5 vs GPT-6.1 Sol API Pricing
Compare verified published API prices for Claude Sonnet 5.5 and GPT-6.1 Sol. This page compares price, not output quality.
Verified Oct 21, 2026, Claude Sonnet 5.5 lists input at $2.00 and output at $10.00 per 1M tokens, while GPT-6.1 Sol lists $2.00 input and $10.00 output. They have the same published list price for both token types; their published long-context pricing tier differs, and this comparison does not assess output quality.
| Model | Input $/1M | Cached input $/1M | Output $/1M | Source | Last verified |
|---|---|---|---|---|---|
| Claude Sonnet 5.5 | $2.00 | $0.10 | $10.00 | Official source | Oct 9, 2026 |
| GPT-6.1 Sol | $2.00 | $0.10 | $10.00 | Official source | Oct 21, 2026 |
Prices from official provider pages, verified on the date shown.
Published rates
Side-by-side API pricing
| Field | Claude Sonnet 5.5 | GPT-6.1 Sol |
|---|---|---|
| Provider | Anthropic | OpenAI |
| Input / 1M | $2.00 | $2.00 |
| Cached input / 1M | $0.10 | $0.10 |
| Output / 1M | $10.00 | $10.00 |
| Batch input / 1M | $1.00 | $1.00 |
| Batch output / 1M | $5.00 | $5.00 |
| Context window | 1M | 1050K |
| Release date | Sep 28, 2026 | Sep 29, 2026 |
| Official source | Anthropic pricing ↗ | OpenAI pricing ↗ |
Standard token prices
Which is cheaper depends on your input:output ratio
Costs below allocate 1M total tokens across each input:output ratio. They use standard prices only, without cache or Batch discounts.
| Input:output ratio | Claude Sonnet 5.5 | GPT-6.1 Sol | Cheaper published price |
|---|---|---|---|
| 10:1 (RAG / long context) | $2.73 | $2.73 | Same price |
| 3:1 (chat) | $4.00 | $4.00 | Same price |
| 1:1 | $6.00 | $6.00 | Same price |
| 1:3 (long generation) | $8.00 | $8.00 | Same price |
Computed examples
Monthly cost for real workloads
| Workload | Assumed volume | Claude Sonnet 5.5 | GPT-6.1 Sol | Difference |
|---|---|---|---|---|
| Side project | 10,000 requests/month | $46.00 | $46.00 | Same cost |
| Customer support chatbot | 10,000 conversations/month | $351.30 | $351.30 | Same cost |
| Agent task | 1,000 tasks/month | $56.00 | $56.00 | Same cost |
Assumptions
- Side project: 10,000 requests per month, with 800 input and 300 output tokens per request.
- Customer support chatbot: 10,000 conversations, with 6 replies per conversation, 600 system tokens, 90 user-message tokens, 1,000 retrieved-context tokens, 180 output tokens per reply, and 50% history carry.
- Agent task: 1,000 tasks, with 8 calls per task and 1,500 input plus 400 output tokens per call.
- All three rows use standard non-cached, non-batch prices and exclude retries, tools, storage, and taxes.
Provider conditions
Pricing rules that can change the answer
GPT-6.1 Sol
Long-context pricing tiers
| Tier | Input | Cached input | Output |
|---|---|---|---|
| Long context | $4.00 | $0.20 | $15.00 |
| Short context | $2.00 | $0.10 | $10.00 |
Batch API: input $1.00 and output $5.00 per 1M tokens.
Verified changes
Price history
On Sep 29, 2026, OpenAI added GPT-6.1 Sol with published input $2.00 and output $10.00 per 1M tokens.
View this update in the price monitorOn Sep 28, 2026, Anthropic added Claude Sonnet 5.5 with published input $2.00 and output $10.00 per 1M tokens.
View this update in the price monitor
Operational costs
Cheaper per token is not always cheaper per task
Retries, failed calls, fallback requests, and longer outputs can raise the cost of completing a task even when the published token price is lower. Model the effect with the LLM Retry & Fallback Cost Calculator, read the cost-per-successful-task guide, or estimate a migration with the Model Switch Cost Calculator.
Primary evidence and next steps
Related
Common questions
Frequently asked questions
Is Claude Sonnet 5.5 cheaper than GPT-6.1 Sol?
Input prices are the same. Output prices are the same. This compares published list prices, not output quality.
How much do Claude Sonnet 5.5 and GPT-6.1 Sol cost for 10,000 requests a month?
At 800 input and 300 output tokens per request, Claude Sonnet 5.5 costs about $46.00 and GPT-6.1 Sol costs about $46.00 at standard list prices.
Which is cheaper for input-heavy workloads like RAG?
At a 10:1 input-to-output token ratio, Claude Sonnet 5.5 costs $2.73 and GPT-6.1 Sol costs $2.73 per 1M total tokens. Same price.
Where do these prices come from?
The prices come from Anthropic and OpenAI official pricing sources, verified on Oct 9, 2026 and Oct 21, 2026, respectively. See the AI API pricing dataset.