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GPT 5.1 Codex Mini vs Muse Spark Open

At a glance

Compact coding model for fast, cost-efficient development tasks.

400K ctx$0.25/$2.00 per M

Meta's strongest open-weight model, trained specifically for agentic coding workflows.

1.0M ctx$1.25/$4.25 per M
Demos
All demos

No shared demos for these models yet.

AI Output
All AI outputs

No captured outputs for these models yet.

Benchmarks
See rankings
Reasoning
CodingInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:Epoch AI·OpenRouter· as of 2026-10-02
Cheaper66%
Agentic
Terminal Tasks61.6%
Reasoning
CodingInsufficient data
AgenticInsufficient data
ReasoningInsufficient data
MathInsufficient data
Sources:OpenRouter
Agentic
Terminal Tasks—
Specs
400K
Context
128K
Max output
Nov 2025
Released
1.0M
Context
256K
Max output
Oct 2026
Released
Capabilities
Vision
Audio
Reasoning
Vision
Audio
Reasoning
Pricing
Live pricing, shown before you run
Input80%$0.25/M tokens
Output53%$2.00/M tokens
Cache read80%$0.03/M tokens
Web search$0.01/search
Live pricing, shown before you run
Input$1.25/M tokens
Output$4.25/M tokens
Cache read$0.15/M tokens
Chat with GPT 5.1 Codex MiniGo to model
Chat with Muse Spark OpenGo to model
Frequently Asked Questions: GPT 5.1 Codex Mini vs Muse Spark Open▼

Which is better, GPT 5.1 Codex Mini or Muse Spark Open?

▼

Both GPT 5.1 Codex Mini and Muse Spark Open are capable AI models. The best choice depends on your specific use case: consider pricing, context window, speed, and which capabilities (vision, reasoning, audio) you need.

Which is cheaper, GPT 5.1 Codex Mini or Muse Spark Open?

▼

GPT 5.1 Codex Mini has a lower blended cost. GPT 5.1 Codex Mini: $0.25 input / $2.00 output. Muse Spark Open: $1.25 input / $4.25 output.

Which has a larger context window, GPT 5.1 Codex Mini or Muse Spark Open?

▼

Muse Spark Open has a larger context window: GPT 5.1 Codex Mini supports 400K tokens vs Muse Spark Open at 1M tokens.

Do both GPT 5.1 Codex Mini and Muse Spark Open support vision?

▼

Yes, both GPT 5.1 Codex Mini and Muse Spark Open support vision/image input.

What are the key differences between GPT 5.1 Codex Mini and Muse Spark Open?

▼

Key differences: GPT 5.1 Codex Mini is significantly cheaper. Compare full specs on this page.

Which model should I choose for my use case?

▼

If cost is your priority, choose the cheaper option. If you need the highest intelligence for complex tasks, pick the higher-scoring model. For long documents or codebases, choose the larger context window. You can try both GPT 5.1 Codex Mini and Muse Spark Open for free on idapt.app to see which performs better for your specific needs.

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