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Ember-1 vs Grok-1.5

Ember-1 leads the LLM Stats Score 43.6 to -2.7.

Fireworks AI · xAI · Updated for 2026

Which is better?

Ember-1 leads the overall LLM Stats Score 43.6 to -2.7, ranking #45 overall.

Based on current LLM Stats indexes, shared benchmarks, pricing, and model metadata for 2026.

Choose Ember-1

  • overall performance matters — it scores 43.6 and ranks #45 on LLM Stats
  • your work emphasizes reasoning and coding — it leads those capability indexes
  • you want the most recent training data — it shipped Sep 2026

Choose Grok-1.5

  • you are already invested in the xAI ecosystem

At a glance

The differences that matter most.

Ember-1
Fireworks AI
Grok-1.5
xAI
Core performance indexes
LLM Stats Score
43.6
#45
-2.7
#353
Reasoning
38.6
#70
-2.2
#343
Coding
38.1
#21
-0.9
#259
Cost, coverage & limits
Benchmark wins
—
—
Input price
$3.00 / M
— / M
Output price
$15.00 / M
— / M
Context window
1,040,000
—

Individual benchmarks

4 reported for Ember-1 · 9 for Grok-1.5

No common benchmarks found

Ember-1 and Grok-1.5don't have any common benchmark datasets to compare. They may have been evaluated on different testing suites.

Human preference

Blind head-to-head votes and playground preference scores

Context Window

Maximum input and output token capacity

Only Ember-1 specifies input context (1,040,000 tokens).

Fireworks AI
Ember-1
Input1,040,000 tokens
Output- tokens
xAI
Grok-1.5
Input- tokens
Output- tokens
Wed Oct 07 2026 • llm-stats.com

License

Usage and distribution terms

Both models are licensed under proprietary licenses.

Both models have usage restrictions defined by their respective organizations.

Ember-1

Proprietary

Closed source

Grok-1.5

Proprietary

Closed source

Release Timeline

When each model was launched

Ember-1 was released on 2026-09-23, while Grok-1.5 was released on 2024-03-28.

Ember-1 is 30 months newer than Grok-1.5.

Ember-1

Sep 23, 2026

2 weeks ago

2.5yr newer
Grok-1.5

Mar 28, 2024

2.5 years ago

Knowledge Cutoff

When training data ends

Neither model specifies a knowledge cutoff date.

Unable to compare the recency of their training data.

No cutoff dates available

Outputs Comparison

Notice missing or incorrect data?

Judge for yourself.

Run your own prompts against Ember-1 and Grok-1.5 side-by-side, then vote on the output you prefer.

Ember-1
✓ Preferred
Grok-1.5
Open in Playground

FAQ

Common questions about Ember-1 vs Grok-1.5.

Which is better, Ember-1 or Grok-1.5?

Ember-1 leads the LLM Stats Score 43.6 to -2.7. Ember-1 is made by Fireworks AI and Grok-1.5 is made by xAI. The best choice depends on your use case — compare their capability indexes, individual benchmarks, pricing, and limits above.

How does Ember-1 compare to Grok-1.5 in benchmarks?

Ember-1 scores SWE-Bench Verified: 92.2%, Terminal-Bench 2.1: 82.0%, DeepSWE 1.1: 75.2%, Tau2 Airline: 66.0%. Grok-1.5 scores GSM8k: 90.0%, DocVQA: 85.6%, MMLU: 81.3%, HumanEval: 74.1%, MMMU: 53.6%.

What are the context window sizes for Ember-1 and Grok-1.5?

Ember-1 supports 1.0M tokens and Grok-1.5 supports an unknown number of tokens. A larger context window lets you process longer documents, conversations, or codebases in a single request.

What are the main differences between Ember-1 and Grok-1.5?

Key differences include LLM Stats Score (43.6 vs -2.7). See the full comparison above for benchmark-by-benchmark results.

Who makes Ember-1 and Grok-1.5?

Ember-1 is developed by Fireworks AI and Grok-1.5 is developed by xAI.

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