Ember-1 vs GPT-5.1 Instant
Ember-1 leads the LLM Stats Score 43.6 to 36.7. GPT-5.1 Instant is 1.7x cheaper per token.
Fireworks AI · OpenAI · Updated for 2026
Which is better?
Ember-1 leads the overall LLM Stats Score 43.6 to 36.7, ranking #46 overall.
The models split the 2 individual benchmarks reported for both models evenly.
On price, GPT-5.1 Instant is roughly 1.7x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
Ember-1 also accepts a larger context window (1,040,000 input tokens), making it the stronger choice for long documents and large codebases.
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 #46 on LLM Stats
- your work emphasizes coding — it leads those capability indexes
- you process long inputs — it offers a 1,040,000 token context window
- you want the most recent training data — it shipped Sep 2026
Choose GPT-5.1 Instant
- cost matters — it's about 1.7x cheaper per token
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
4 reported for Ember-1 · 9 for GPT-5.1 Instant
Ember-1 outperforms in 1 benchmarks (SWE-Bench Verified), while GPT-5.1 Instant is better at 1 benchmark (Tau2 Airline).
Both models are evenly matched across the benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, Ember-1 ($3.00/1M tokens) is 2.4x more expensive than GPT-5.1 Instant ($1.25/1M tokens).
For output processing, Ember-1 ($15.00/1M tokens) is 1.5x more expensive than GPT-5.1 Instant ($10.00/1M tokens).
In conclusion, Ember-1 is more expensive than GPT-5.1 Instant.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
Ember-1 accepts 1,040,000 input tokens compared to GPT-5.1 Instant's 400,000 tokens. Only GPT-5.1 Instant specifies output context (128,000 tokens).
Input capabilities
Documented input modalities across available providers
GPT-5.1 Instant supports multimodal inputs, whereas Ember-1 does not.
GPT-5.1 Instant can handle both text and other forms of data like images, making it suitable for multimodal applications.
Ember-1
GPT-5.1 Instant
License
Usage and distribution terms
Both models are licensed under proprietary licenses.
Both models have usage restrictions defined by their respective organizations.
Proprietary
Closed source
Proprietary
Closed source
Release Timeline
When each model was launched
Ember-1 was released on 2026-09-23, while GPT-5.1 Instant was released on 2025-11-12.
Ember-1 is 11 months newer than GPT-5.1 Instant.
Sep 23, 2026
2 weeks ago
10mo newerNov 12, 2025
10 months ago
Knowledge Cutoff
When training data ends
Neither model specifies a knowledge cutoff date.
Unable to compare the recency of their training data.
Provider Availability
Ember-1 is available from Fireworks. GPT-5.1 Instant is available from OpenAI.
Ember-1
GPT-5.1 Instant
Outputs Comparison
Judge for yourself.
Run your own prompts against Ember-1 and GPT-5.1 Instant side-by-side, then vote on the output you prefer.
FAQ
Common questions about Ember-1 vs GPT-5.1 Instant.