# xAI vs Morph

> Not substitutes. Grok can write the code; Morph's small models apply those edits to files at 10,500+ tokens per second.

Canonical: https://www.subconscious.dev/compare/xai-vs-morph · By The Subconscious Team · Updated September 30, 2026

## How they compare

Morph does one step of a coding agent very well. A large model writes only the changed lines with existing-code markers, and Morph's Fast Apply merges them into the full file at 10,500+ tokens per second with up to 98% accuracy. Morph also offers WarpGrep for repository search, Compact for context compression and Reflex for classification. xAI is the kind of model that sits upstream: Grok 4.6, which xAI recommends for code, and grok-build, its dedicated coding model. Grok writes the change. Morph applies it.

Pairing them trims the bill in two places. Grok's output is already cheap at $6 per million on Grok 4.6, and having it write only diffs cuts output further, with Morph reporting about 40% fewer tokens than full-file rewrites. WarpGrep and Compact can also help keep prompts under 200K tokens, where xAI doubles the price of the whole request. Morph's 2 to 4% merge error rate means tests or linting still need to check edits before they ship.

## What each one does

### xAI

xAI sells the Grok models through its own API. Grok 4.6 is the current flagship and xAI tells developers to use it for everything outside audio, image and video, code included. It has a 500K context window and costs $2 in and $6 out per million tokens under 200K prompt tokens. Older Grok 4.20 and 4.3 models keep a 1M window at $1.25 in and $2.50 out, which is aggressive for that capability class.

### Morph

Morph builds small, very fast specialist models that sit beside a big coding model inside an agent. Its flagship is Fast Apply. The frontier model writes only the changed lines with // ... existing code ... markers, and Morph merges them into the full file at 10,500+ tokens per second with up to 98% accuracy. It is the same idea behind Cursor's instant apply, offered as an OpenAI-compatible API.

## Which is best, and when

### Choose xAI for

- Writing code changes with Grok 4.6 or grok-build
- Reasoning and planning steps in a coding agent
- Agents that also need live web or X data

### Choose Morph for

- Applying diffs to large files at high speed
- Cutting output tokens versus full-file rewrites
- Compressing context before it hits the main model

## At a glance

| Attribute | xAI | Morph |
|---|---|---|
| Model access | Closed | Specialist models |
| Flagship models | Grok 4.6, Grok 4.20, grok-build | morph-v3-fast, morph-v3-large |
| Speed | ~54 tok/s on Grok 4.6 | 10,500+ tok/s Fast Apply |
| Price | $2 in, $6 out (Grok 4.6); 2x past 200K | ~40% fewer tokens than full rewrites |
| Customization | - | Fine-tuning offered |
| Deployment | First-party API | OpenAI-compatible API |
| Long context | 500K (4.6), 1M (4.20, 4.3) | - |

## FAQ

### What is the difference between xAI and Morph?

Not substitutes. Grok can write the code; Morph's small models apply those edits to files at 10,500+ tokens per second.

### When should I choose xAI over Morph?

Writing code changes with Grok 4.6 or grok-build; Reasoning and planning steps in a coding agent; Agents that also need live web or X data.

### When should I choose Morph over xAI?

Applying diffs to large files at high speed; Cutting output tokens versus full-file rewrites; Compressing context before it hits the main model.

### Is xAI or Morph cheaper?

xAI: $2 in, $6 out (Grok 4.6); 2x past 200K. Morph: ~40% fewer tokens than full rewrites. The cheaper choice depends on the model and workload.

## Running long-horizon agents?

If your agents run past 200K tokens, compare both against Subconscious: [Subconscious vs xAI](https://www.subconscious.dev/compare/subconscious-vs-xai.md), [Subconscious vs Morph](https://www.subconscious.dev/compare/subconscious-vs-morph.md).

Full profiles: [xAI](https://www.subconscious.dev/providers/xai.md), [Morph](https://www.subconscious.dev/providers/morph.md).