Ember-1 vs GPT-5 High: Specs & Benchmark Comparison
Ember-1 is developed by Fireworks AI, while GPT-5 High comes from OpenAI. GPT-5 High was released in August 2025, and Ember-1 followed 13 months later in September 2026. Ember-1 has a published size of about 2.8 trillion parameters; OpenAI has not disclosed the parameter count of GPT-5 High.
We have 4 benchmark results for Ember-1 and 2 benchmark results for GPT-5 High, but they were measured on different benchmarks, so there is no like-for-like scoreboard.
GPT-5 High is the cheaper API at $1.25 per million input tokens and $10 per million output tokens, roughly 2 times cheaper than Ember-1 at $3 and $15. Ember-1 takes the larger context window at 1M tokens, compared with 400K for GPT-5 High. Ember-1 accepts text as input, while GPT-5 High accepts text and images.
| Characteristic | Ember-1 | GPT-5 High |
|---|---|---|
| Company | Fireworks AI | OpenAI |
| Release Date | September 23, 2026 | August 6, 2025 |
| Parameters | 2.8T | — |
| Multimodal | No | Yes |
| Context (input) | 1.0M | 400K |
| Context (output) | — | 128K |
| Input Price / 1M | $3.00 | $1.25 |
| Output Price / 1M | $15.00 | $10.00 |
| Average Score | 78.8% | 91.0% |
Verdict
Ember-1 leads in 2 out of 4 comparison categories.
Both models show comparable average scores: Ember-1 — 0.8, GPT-5 High — 0.9.
GPT-5 High is 1.6x cheaper: input $1.25/1M vs $3.00/1M tokens.
Ember-1 supports a larger context: 1M vs 400K tokens.
Ember-1 is newer: released 9/23/2026 vs 8/6/2025.
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Frequently Asked Questions
Which is better for coding — Ember-1 or GPT-5 High?
Which model is cheaper — Ember-1 or GPT-5 High?
Which has a larger context window — Ember-1 or GPT-5 High?
The Ember-1 and GPT-5 High comparison is updated for 2026. Data includes benchmark results, API pricing, context window size and other specifications. For more detailed information, visit the Ember-1 or GPT-5 High page. See also the complete list of AI model comparisons.