High-volume, cost-sensitive work
Choose GPT-6 Astra Pro
GPT-6 Astra Pro costs 47% less on a typical mix of three input tokens for every output token ($20.00 against $37.50 per million tokens).
GPT-4 vs GPT-6 Astra Pro: price, context and capabilities
Choose GPT-6 Astra Pro for high-volume, cost-sensitive work, writing and code generation, very long inputs, images as input and the latest release; on the other points the two are level or the data is missing.
In short
- GPT-6 Astra Pro is 47% cheaper than GPT-4 at the headline price ($20.00 / 1M tokens vs $37.50 / 1M tokens).
- GPT-6 Astra Pro reads more per request: 1.05M tokens against 8k.
- GPT-6 Astra Pro is the newer model (Sep 4, 2026, against March 2023).
- Only GPT-4 offers batch api.
- Only GPT-6 Astra Pro offers vision, reasoning, prompt caching.
Which should you choose?
Each answer below comes straight from the published prices, specifications and independent benchmark results.
Writing and code generation
Choose GPT-6 Astra Pro
GPT-6 Astra Pro charges $50.00 per million output tokens, against $60.00 for GPT-4. Output dominates the bill when answers are long.
Very long inputs
Choose GPT-6 Astra Pro
GPT-6 Astra Pro reads up to 1.05M tokens per request, against 8k for GPT-4.
Images as input
Choose GPT-6 Astra Pro
GPT-6 Astra Pro accepts images as input; GPT-4 does not.
Latest release
Choose GPT-6 Astra Pro
GPT-6 Astra Pro is the newer release (Sep 4, 2026, against March 2023 for GPT-4).
Monthly cost at three volumes
| Volume | GPT-4 | GPT-6 Astra Pro | Difference |
|---|---|---|---|
| Prototype: 1M input, 250K output tokens | $45.00 | $22.50 | GPT-6 Astra Pro, $22.50 less |
| Production: 20M input, 5M output tokens | $900.00 | $450.00 | GPT-6 Astra Pro, $450.00 less |
| Scale: 500M input, 100M output tokens | $21,000 | $10,000 | GPT-6 Astra Pro, $11,000 less |
Standard rates, without caching or batch discounts. Volumes are per month.
Specifications side by side
| GPT-4 | GPT-6 Astra Pro | |
|---|---|---|
| Provider | OpenAI | OpenAI |
| Category | Language models | Language models |
| Status | Deprecated | Generally available |
| Headline price | $37.50 / 1M tokens | $20.00 / 1M tokens |
| Input | $30.00 / 1M tokens | $10.00 / 1M tokens |
| Output | $60.00 / 1M tokens | $50.00 / 1M tokens |
| Cached input | No data | $1.00 / 1M tokens |
| Context window | 8k | 1.05M |
| Max output | 8k | 128k |
| Released | March 2023 | Sep 4, 2026 |
| Knowledge cutoff | December 2023 | No data |
| Licence | Proprietary | Proprietary |
| Capabilities | Tool calling, Structured output, Batch API | Vision, Reasoning, Tool calling, Structured output, Prompt caching |
| API model id | gpt-4 | gpt-6-astra-pro |
Benchmarks side by side
Leader in bold.
| Benchmark | GPT-4 | GPT-6 Astra Pro |
|---|---|---|
| GPQA Diamond | 34.9% | No data |
| IFBench (instruction following) | 33.2% | No data |
Independent evaluations by Artificial Analysis, run the same way for every model, at the reasoning setting shown. Percentages unless marked as an index.
Frequently asked questions
Should I choose GPT-4 or GPT-6 Astra Pro?
Choose GPT-6 Astra Pro for high-volume, cost-sensitive work, writing and code generation, very long inputs, images as input and the latest release; on the other points the two are level or the data is missing.
Which is cheaper, GPT-4 or GPT-6 Astra Pro?
GPT-6 Astra Pro is 47% cheaper than GPT-4 at the headline price ($20.00 / 1M tokens vs $37.50 / 1M tokens).
Which has the larger context window, GPT-4 or GPT-6 Astra Pro?
GPT-6 Astra Pro reads more per request: 1.05M tokens against 8k.
What is the difference between GPT-4 and GPT-6 Astra Pro?
GPT-4 is made by OpenAI and GPT-6 Astra Pro by OpenAI. GPT-6 Astra Pro is 47% cheaper than GPT-4 at the headline price ($20.00 / 1M tokens vs $37.50 / 1M tokens). GPT-6 Astra Pro reads more per request: 1.05M tokens against 8k. GPT-6 Astra Pro is the newer model (Sep 4, 2026, against March 2023). Only GPT-4 offers batch api. Only GPT-6 Astra Pro offers vision, reasoning, prompt caching.
How much do GPT-4 and GPT-6 Astra Pro cost per month?
At 20 million input and 5 million output tokens a month, GPT-4 costs $900.00 and GPT-6 Astra Pro costs $450.00, at standard rates.
Which is newer, GPT-4 or GPT-6 Astra Pro?
GPT-6 Astra Pro was released on Sep 4, 2026 and GPT-4 on March 2023.