API price comparison · Updated
Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. For an agent task (80,000 input tokens, 60,000 of them cached, and 6,000 output), Claude Opus 5.5 costs $0.212 and GPT-6 Astra $0.560: GPT-6 Astra costs 2.6× as much.
Claude Opus 5.5 costs 60% less for this workload. Excludes cache writes, tools and taxes.
| Price | Claude Opus 5.5 | GPT-6 Astra |
|---|---|---|
| Model ID | claude-opus-5-5 | gpt-6-astra |
| Input | $4.00 | $10.00 |
| Cache read | $0.20 | $1.00 |
| Cache write | $5.00 | $12.50 |
| Output | $20.00 | $50.00 |
| Batch in / out | $2.00 / $10.00 | $5.00 / $25.00 |
| Long prompts | Same rate | Over 272,000: $20.00 / $75.00 |
| Scheduled change | None announced | None announced |
| Status | Available | Available |
Prices for each provider’s own API, from Anthropic’s pricing page and OpenAI’s pricing page. The lower price in each row is highlighted. Ganivra uses these same rates to price Claude Opus 5.5 and GPT-6 Astra calls.
Worked out from the prices above at standard rates, with no Batch discount. Long-prompt rates apply where a model has them.
| Request | Claude Opus 5.5 | GPT-6 Astra | Per 1,000 requests | Difference |
|---|---|---|---|---|
| Chat reply3,000 input tokens, 500 output | $0.022 | $0.055 | $22.00 / $55.00 | GPT-6 Astra costs 2.5× as much |
| Document summary30,000 input tokens, 1,500 output | $0.150 | $0.375 | $150 / $375 | GPT-6 Astra costs 2.5× as much |
| Agent task80,000 input tokens (60,000 cached), 6,000 output | $0.212 | $0.560 | $212 / $560 | GPT-6 Astra costs 2.6× as much |
| Long document300,000 input tokens, 2,000 output | $1.24 | $6.15 | $1,240 / $6,150 | GPT-6 Astra costs 5× as much |
Ganivra prices every Claude Opus 5.5 and GPT-6 Astra call you make and adds it up by customer, feature and workflow, next to what each customer pays. Switch a workflow and see what it did to each customer’s margin.
Per million tokens, Claude Opus 5.5 costs $4.00 input and $20.00 output, and GPT-6 Astra $10.00 input and $50.00 output. For an agent task (80,000 input tokens, 60,000 of them cached, and 6,000 output), GPT-6 Astra costs 2.6× as much: $212 against $560 per 1,000 tasks.
$4.00 input and $20.00 output per million tokens on Anthropic's API, with cached input at $0.20 and Batch at $2.00 input and $10.00 output. The rate is the same at any prompt length.
$10.00 input and $50.00 output per million tokens on OpenAI's API, with cached input at $1.00 and Batch at $5.00 input and $25.00 output. Prompts over 272,000 tokens cost $20.00 input and $75.00 output.
For a 300,000 input tokens, 2,000 output request, Claude Opus 5.5 costs $1.24 and GPT-6 Astra $6.15: GPT-6 Astra costs 5× as much. On Claude Opus 5.5, one rate at any prompt length; on GPT-6 Astra, prompts over 272,000 tokens cost $20.00 input and $75.00 output for the whole request.
Record what each call actually used, then price the same usage on both models. Ganivra does this from your recorded calls: it shows what each customer, feature and workflow would cost on Claude Opus 5.5 and on GPT-6 Astra, next to what each customer pays you.
Every model on one page: Claude Opus 5.5 pricing · GPT-6 Astra pricing · all model price comparisons · all supported models.