# DeepSeek V4 Pro vs GPT-6 Astra

Canonical HTML page: [DeepSeek V4 Pro vs GPT-6 Astra](<https://impossibl.com/compare/deepseek/deepseek-v4-pro/openai/gpt-6-astra>)
Markdown alternative: [DeepSeek V4 Pro vs GPT-6 Astra as Markdown](<https://impossibl.com/compare/deepseek/deepseek-v4-pro/openai/gpt-6-astra.md>)

Compare API pricing, context windows, and capabilities side by side. Prices are published API usage rates in USD; check billing units and context tiers alongside each price.

## Specifications and pricing

| Specification | DeepSeek V4 Pro | GPT-6 Astra |
| --- | --- | --- |
| API identifier | deepseek/deepseek-v4-pro | openai/gpt-6-astra |
| Creator | DeepSeek | OpenAI |
| Model type | Text generation | Text generation |
| Inputs | text | text, image |
| Outputs | text | text |
| Base input price (USD) | $1.74 per million input tokens | $10.00 per million input tokens |
| Base output price (USD) | $3.48 per million output tokens | $50.00 per million output tokens |
| Cache read price (USD) | $0.145 per million cached input tokens | $1.00 per million cached input tokens |
| Cache write price (USD) | Not published | $12.50 per million tokens |
| One-hour cache write price (USD) | Not published | Not published |
| Audio input token price (USD) | Not published | Not published |
| Context window | 1,000,000 tokens | 1,050,000 tokens |
| Tool calling | Not published | Not published |
| Endpoints | /v1/chat/completions | /v1/chat/completions |
| Context pricing tiers (USD per million tokens) | None published | Over 272,000 input tokens: $20.00 input / $75.00 output |
| Retirement | Not announced in the public catalog | Not announced in the public catalog |

When total input, including cached input, strictly exceeds a context threshold, the highest qualifying tier applies to the whole request. Consult each model's complete Markdown for tier-specific cache rates; an unpublished tier cache price does not establish the base cache rate.

## DeepSeek V4 Pro vs GPT-6 Astra: side-by-side summary

DeepSeek V4 Pro and GPT-6 Astra are available through the Impossibl API.

They share the `/v1/chat/completions` endpoint. Set the model identifier to select the model for a supported request.

DeepSeek V4 Pro is created by DeepSeek. It has a 1,000,000-token context window. Base API pricing (USD): $1.74 per million input tokens; $3.48 per million output tokens.

GPT-6 Astra is created by OpenAI. It has a 1,050,000-token context window. Base API pricing (USD): $10.00 per million input tokens; $50.00 per million output tokens. Above 272,000 input tokens per request, context-tier rates apply to the whole request.

## Model details

- [DeepSeek V4 Pro: full model facts as Markdown](<https://impossibl.com/deepseek/deepseek-v4-pro.md>); [HTML model page](<https://impossibl.com/deepseek/deepseek-v4-pro>)
- [GPT-6 Astra: full model facts as Markdown](<https://impossibl.com/openai/gpt-6-astra.md>); [HTML model page](<https://impossibl.com/openai/gpt-6-astra>)

For compatible text or embedding models with token pricing, the HTML comparison page provides a shared workload calculator. It excludes cache creation, tool calls, taxes, balance-purchase fees, and workspace-specific adjustments.

## Sources and related links

Prices, capabilities, limits, and availability describe the public Impossibl API offering. An unpublished fact is unknown; a published zero price is zero. Compare matching billing units and check context tiers before estimating costs.

- [Public Impossibl model catalog](<https://api.impossibl.com/v1/models>)
- [Full model directory as JSON](<https://impossibl.com/models.json>)
- [Model directory as Markdown](<https://impossibl.com/models.md>)
- [API quickstart](<https://impossibl.com/docs/agent-quickstart>)
- [Model documentation](<https://impossibl.com/docs/models>)