# OpenAI vs Inception

> OpenAI sells closed models from the frontier down to cheap high-volume tiers. Inception sells closed diffusion models built for fast output at low prices.

Canonical: https://www.subconscious.dev/compare/openai-vs-inception · By The Subconscious Team · Updated October 11, 2026

## How they compare

OpenAI's lineup runs from GPT-6 Astra at $10 in and $50 out to GPT-6 Luna at $0.10 in and $0.50 out, all with 1.05M context, plus hosted tools, the Agents SDK, caching and Batch discounts. Inception's Mercury 2.5 is a diffusion reasoning model with tool use, JSON mode and 260K context at $0.20 in and $0.75 out. Inception reports over 1,100 tokens per second; Artificial Analysis measures about 640. Its quality sits with cost-optimized models, not the frontier.

OpenAI is the pick for frontier quality, long agent runs and the largest ecosystem. Inception competes with the cheap end of the lineup: higher per-token prices than Luna but much faster output, for latency-critical loops like autocomplete, voice and real-time chat. Both are closed and both sell through Azure and AWS Bedrock.

## What each one does

### OpenAI

OpenAI runs the most widely adopted closed-model API. Its October 2026 lineup has GPT-6 Astra at the top for computer use, coding and long agentic runs, priced at $10 in and $50 out per million tokens. Below it sit GPT-6.1 Sol, the default for coding, research and computer use at $2 in and $10 out, and GPT-6 Luna for high-volume jobs at $0.10 in and $0.50 out. All three carry a 1.05M token context window with up to 128K output.

### Inception

Inception builds diffusion large language models (dLLMs). Every other LLM on this list generates text one token at a time; Inception's Mercury models start from a rough draft of a whole block and refine it over a few passes, producing many tokens in parallel. That ties speed less to output length and lets the models run fast on ordinary NVIDIA GPUs rather than custom chips. The company was founded by professors from Stanford, UCLA and Cornell behind core work on diffusion, Flash Attention and DPO, and is led by Stanford's Stefano Ermon. It raised a $50M seed in November 2025 led by Menlo Ventures, with Mayfield, M12, NVentures, Snowflake and Databricks, plus Andrew Ng and Andrej Karpathy as angels.

## Which is best, and when

### Choose OpenAI for

- Frontier coding and computer use
- Long agentic runs with hosted tools
- The largest SDK and integration ecosystem

### Choose Inception for

- Very fast output for real-time loops
- Cheap reasoning with tool use
- Voice agents and code autocomplete

## At a glance

| Attribute | OpenAI | Inception |
|---|---|---|
| Model access | Closed, plus open gpt-oss | Closed weights (Mercury dLLMs) |
| Flagship models | GPT-6 Astra, GPT-6.1 Sol, GPT-6 Luna | Mercury 2.5, Mercury 2 |
| Speed | Fast mode; Ultrafast on GPT-6 Astra | 1,100+ tok/s (vendor); ~640 measured |
| Price | $0.10–$10 in, $0.50–$50 out per 1M | $0.20 in, $0.75 out (Mercury 2.5) |
| Customization | N/A | Fine-tuning on request |
| Deployment | API, Azure OpenAI, Bedrock | Serverless API, Bedrock, Azure, private |
| Long context | 1.05M; 2x input past 272K | 260K |

## FAQ

### What is the difference between OpenAI and Inception?

OpenAI sells closed models from the frontier down to cheap high-volume tiers. Inception sells closed diffusion models built for fast output at low prices.

### When should I choose OpenAI over Inception?

Frontier coding and computer use; Long agentic runs with hosted tools; The largest SDK and integration ecosystem.

### When should I choose Inception over OpenAI?

Very fast output for real-time loops; Cheap reasoning with tool use; Voice agents and code autocomplete.

### Is OpenAI or Inception cheaper?

OpenAI: $0.10–$10 in, $0.50–$50 out per 1M. Inception: $0.20 in, $0.75 out (Mercury 2.5). The cheaper choice depends on the model and workload.

### Which has more context, OpenAI or Inception?

OpenAI: 1.05M; 2x input past 272K. Inception: 260K.

## Running long-horizon agents?

If your agents run past 200K tokens, compare both against Subconscious: [Subconscious vs OpenAI](https://www.subconscious.dev/compare/subconscious-vs-openai.md), [Subconscious vs Inception](https://www.subconscious.dev/compare/subconscious-vs-inception.md).

Full profiles: [OpenAI](https://www.subconscious.dev/providers/openai.md), [Inception](https://www.subconscious.dev/providers/inception.md).