GPT-6 Astra Pro Paid vs INMercury 2.5 Paid
GPT-6 Astra Pro vs Mercury 2.5 compared — price per token, context window, multimodality, openness and which to choose. Full 2026 breakdown.
GPT-6 Astra Pro — full profile › · Mercury 2.5 — full profile ›
Prices & specs refreshed from live data · olud.ai
Open-model prices = cheapest provider via OpenRouter; official maker rates may be higher.
$50 /M outputManaged API (no infra to run)
$0.15 /M outputManaged API (no infra to run)
GPT-6 Astra Pro vs Mercury 2.5 specs
| Spec | GPT-6 Astra Pro | Mercury 2.5 | Winner |
|---|---|---|---|
| Maker | OpenAI | Inception | – |
| Type | Proprietary | Proprietary | – |
| Context window | 1.1M tokens | 260K tokens | |
| Input price | $10/M | $0.04/M | INMercury 2.5 |
| Output price | $50/M | $0.15/M | INMercury 2.5 |
| Vision / multimodal | Yes | No | |
| Tool / function calling | Yes | Yes | = Tie |
| Self-hostable | No (API only) | No (API only) | – |
| License | Proprietary | Proprietary | – |
Price gap & when to choose each
Mercury 2.5 is ~333× cheaper than GPT-6 Astra Pro on output tokens ($0.15 vs $50 per M tokens).
- You want frontier performance through a managed API
- You need the longer 1.1M context window
- You value reliability & ecosystem
- You don't want to manage infrastructure
- You want frontier performance through a managed API
- You want the lower output price
- You value reliability & ecosystem
- You don't want to manage infrastructure
Feature comparison
| Capability | GPT-6 Astra Pro | Mercury 2.5 |
|---|---|---|
| Open weights (downloadable) | ✗ | ✗ |
| Self-hostable | ✗ | ✗ |
| Runs fully offline | ✗ | ✗ |
| Vision / multimodal | ✓ | ✗ |
| Tool / function calling | ✓ | ✓ |
| 1M+ context window | ✓ | ✗ |
How GPT-6 Astra Pro and Mercury 2.5 score
| Criterion | GPT-6 Astra Pro | Mercury 2.5 |
|---|---|---|
| Cost-efficiency | 2.0 | 5.0 |
| Context window | 5.0 | 4.0 |
| Openness | 1.5 | 1.5 |
| Self-hosting | 1.0 | 1.0 |
| Multimodality | 5.0 | 3.5 |
Scores come from live data — output price (cost), context length, open vs closed weights (openness & self-hosting) and vision/tool support (multimodality). Raw task quality isn't scored here; it depends on your benchmark — see the verdict.
What each model is
GPT-6 Astra Pro Paid
GPT-6 Astra Pro is the same underlying model as [GPT-6 Astra](https://openrouter.ai/openai/gpt-6-astra), served with `reasoning.mode` set to `pro` for higher-quality responses on complex tasks. Learn more in OpenAI's docs: https://develope
Mercury 2.5 Paid
Mercury 2.5 is the fastest reasoning LLM, and the latest diffusion LLM (dLLM) from Inception. Instead of generating tokens sequentially, Mercury 2.5 produces and refines multiple tokens in parallel, achieving...
Frequently asked questions
GPT-6 Astra Pro vs Mercury 2.5 — which is cheaper?
Mercury 2.5 is cheaper on output ($0.15/M vs $50/M).
Which has the larger context window?
GPT-6 Astra Pro offers the larger context window (1.1M tokens).
GPT-6 Astra Pro vs Mercury 2.5 — which should I pick in 2026?
Choose Mercury 2.5 for the lower output price ($0.15/M vs $50/M). Choose GPT-6 Astra Pro if you need the larger 1.1M context window.
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