Muse Spark Open
meta/muse-spark-openMuse Spark Open is a coding-optimized open-weight model.
Standard pricing
Run this model at its standard rate. Cheap mode currently has no separate discount.
API routing ceilings, including your 5% Free-plan fee. Included usage applies first, then prepaid credits. Cached tokens and tools can have separate charges.
Other models with discounted rates
See all discounts →These are different models. Cheap mode may be slower; discounts compare each model’s own standard rate.
Choose how to use Muse Spark Open
Playground
Try prompts in your browser, create an agent, and see the cost of each reply. Your selected model carries into setup.
Model capabilities below describe the underlying model. Available playground features depend on its provider.
API
Connect your app with a Gizmo API key. Choose fastest or cheapest, stream text responses, and inspect timing, tokens, and charges in request logs.
A current API route is listed for this exact model. Gateway configuration is required for live calls.
Provider price + a transparent platform fee
| Rate | Provider baseline | Free plan · 5% fee | Paid plan · 4% fee |
|---|---|---|---|
| Input / 1M tokens | $1.25 | $1.3125 | $1.3 |
| Output / 1M tokens | $4.25 | $4.4625 | $4.42 |
| API input / 1M tokens | $1.25 | $1.3125 | $1.3 |
| API output / 1M tokens | $4.25 | $4.4625 | $4.42 |
Legacy chat image rates use the catalog baseline. The dedicated image playground shows separate estimates and settles the provider’s metered usage. API rates are current routing ceilings; final API charges use provider-reported cost plus your fee. Cheapest routing compares eligible OpenRouter and Cheaper Inference rates for the same model; savings are not guaranteed. Cached input or other provider charges may differ. Compare all model rates and verified discounts →
How your plan pays for usage
API and playground share one included allowance. Usage including the fee draws from that allowance first, then your prepaid credits. Plans bill monthly; included usage resets weekly: Free $1, Starter $5, Growth $25, Scale $50.
A $1 provider charge becomes $1.05 on Free or $1.04 on a paid plan before included usage is applied. Plan eligibility still applies in the playground.
Free models and limits
Zero-cost models stay $0, including the fee, and do not consume your dollar allowance. Free accounts can make 1,000 free-model API requests per calendar month, resetting in UTC. Admitted requests count even if the provider fails.
Free includes 20 API requests/minute and 6 playground messages/minute. Paid plans raise these limits. See plan limits.
Before a text API request, Gizmo temporarily reserves included usage and, if necessary, prepaid credit for the model’s full context plus your maximum output. Image jobs reserve twice their displayed estimate. Unused funds return after metering. This hold can exceed the final charge; unconfirmed usage remains marked pending.
Overview
Muse Spark Open is a coding-optimized open-weight model. Trained specifically for agentic coding workflows, it delivers higher first-attempt accuracy, reliable tool calling, and deep codebase understanding across the repos developers actually work in.
Capabilities
Reasoning is always on with effort levels xhigh · high · medium · low (default medium).
Sampling controls: temperature, top_p, top_k, min_p, max_tokens, frequency_penalty, presence_penalty, repetition_penalty.
Pricing on Gizmo
These are provider baseline rates before Gizmo’s 5% Free-plan or 4% paid-plan fee. Your included usage covers charges first; overage uses prepaid credits. See the fee-inclusive comparison above.
Provider baseline rates
- Input
- $1.25 / 1M
- Cached input
- $0.15 / 1M
- Output
- $4.25 / 1M
Examples before the platform fee
- Typical chat turn
- $0.0046 2k in · 500 out
- $1 of input
- ≈ 800k tokens
- $1 of output
- ≈ 235k tokens
- Full context, once
- $1.31
Providers and pricing
5 ways to run Muse Spark Open on Gizmo, cheapest first. Requests follow your routing choice and fall back down this list if a provider fails.
| Provider | Route | Input / 1M | Output / 1M | Context | Uptime 24h |
|---|---|---|---|---|---|
| Makora · fp4Lowest price | OpenRouter | $1.25 | $4.25 | 1.05M | 100% |
| ModalLowest price | OpenRouter | $1.25 | $4.25 | 1M | 100% |
| TogetherLowest price | OpenRouter | $1.25 | $4.25 | 1.05M | 99.4% |
| Nebius · fp4Lowest price | OpenRouter | $1.25 | $4.25 | 1.05M | 100% |
| BaseTen · fp4Lowest price | OpenRouter | $1.25 | $4.25 | 1.05M | 100% |
Rates are each provider’s, per million tokens, before Gizmo’s 5% (Free) or 4% (paid) fee. “Cheapest” routing starts at the top of this list; “Fastest” starts with the model’s maker.
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Run Muse Spark Open in under a minute
Create your account
Sign up with just an email. Start on the free tier with no card, or pick a paid plan for a bigger weekly allowance and $25 in bonus credits.
Your agent is ready
Muse Spark Open is preselected as the brain of your first agent. Give it a name and a system prompt, or keep the defaults.
Chat, research, create
Live web research and image generation are built in. Every reply shows what it cost, and you can switch models anytime.