GPT-6 Astra vs Muse Spark Open
GPT-6 Astra leads the LLM Stats Score 58.1 to 44.9. Muse Spark Open is 10.0x cheaper per token.
OpenAI · Meta · Updated for 2026
Which is better?
GPT-6 Astra leads the overall LLM Stats Score 58.1 to 44.9, ranking #3 overall.
In the 2 individual benchmarks reported for both models, GPT-6 Astra wins 2; this is a narrower head-to-head signal than the composite indexes.
On price, Muse Spark Open is roughly 10.0x cheaper per token on a blended 3:1 input/output basis, which adds up quickly at production volume.
GPT-6 Astra also accepts a larger context window (1,050,000 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 GPT-6 Astra
- overall performance matters — it scores 58.1 and ranks #3 on LLM Stats
- your work emphasizes reasoning and coding — it leads those capability indexes
- you value its reported benchmark strengths — it wins 2 of 2 exact shared results
- you process long inputs — it offers a 1,050,000 token context window
Choose Muse Spark Open
- cost matters — it's about 10.0x cheaper per token
- you want the most recent training data — it shipped Oct 2026
- you need open weights you can self-host or fine-tune
At a glance
The differences that matter most.
Capability indexes
Additional strengths measured across groups of related public benchmarks
Individual benchmarks
22 reported for GPT-6 Astra · 17 for Muse Spark Open
GPT-6 Astra outperforms in 2 benchmarks (DeepSWE 1.1, GPQA), while Muse Spark Open is better at 0 benchmarks.
GPT-6 Astra significantly outperforms across most benchmarks.
Human preference
Blind head-to-head votes and playground preference scores
Pricing Analysis
Price comparison per million tokens
For input processing, GPT-6 Astra ($10.00/1M tokens) is 8.0x more expensive than Muse Spark Open ($1.25/1M tokens).
For output processing, GPT-6 Astra ($50.00/1M tokens) is 11.8x more expensive than Muse Spark Open ($4.25/1M tokens).
In conclusion, GPT-6 Astra is more expensive than Muse Spark Open.*
* Using a 3:1 ratio of input to output tokens
Context Window
Maximum input and output token capacity
GPT-6 Astra accepts 1,050,000 input tokens compared to Muse Spark Open's 1,048,576 tokens. Muse Spark Open can generate longer responses up to 1,048,576 tokens, while GPT-6 Astra is limited to 128,000 tokens.
Input capabilities
Documented input modalities across available providers
Both GPT-6 Astra and Muse Spark Open support multimodal inputs.
They are both capable of processing various types of data, offering versatility in application.
GPT-6 Astra
Muse Spark Open
License
Usage and distribution terms
GPT-6 Astra is licensed under a proprietary license, while Muse Spark Open uses Muse Model License.
License differences may affect how you can use these models in commercial or open-source projects.
Proprietary
Closed source
Muse Model License
Open weights
Release Timeline
When each model was launched
GPT-6 Astra was released on 2026-09-04, while Muse Spark Open was released on 2026-10-15.
Muse Spark Open is 1 month newer than GPT-6 Astra.
Sep 4, 2026
1 months ago
Oct 15, 2026
4 days ago
1mo newerKnowledge Cutoff
When training data ends
GPT-6 Astra has a documented knowledge cutoff of 2026-04-30, while Muse Spark Open's cutoff date is not specified.
We can confirm GPT-6 Astra's training data extends to 2026-04-30, but cannot make a direct comparison without Muse Spark Open's cutoff date.
Apr 2026
—
Provider Availability
GPT-6 Astra is available from OpenAI. Muse Spark Open is available from Together.
GPT-6 Astra
Muse Spark Open
Outputs Comparison
Judge for yourself.
Run your own prompts against GPT-6 Astra and Muse Spark Open side-by-side, then vote on the output you prefer.
FAQ
Common questions about GPT-6 Astra vs Muse Spark Open.