GPT-5.6 Sol vs Muse Spark Open vs Muse Wonder
Too close to call on our weighted score (Muse Wonder 68, Muse Spark Open 68, GPT-5.6 Sol 66). The right pick depends on what you value most.
OpenAIGPT-5.6 Sol
66/100- ECI162.6
- Price$4.00 / $20.00
- Context1.05M
MetaMuse Spark Open
68/100- ECI155.1
- Price$1.25 / $4.25
- Context1.05M
- Meta
Muse Wonder
68/100- ECI161.7
- Price$4.00 / $20.00
- Context1.05M
Too close to call
It is close. Our weighted score puts them within a point (Muse Wonder 68/100, Muse Spark Open 68/100, GPT-5.6 Sol 66/100), so choose by what matters most for your work: GPT-5.6 Sol for raw capability and Muse Spark Open on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityGPT-5.6 SolCapabilities Index (ECI): GPT-5.6 Sol 162.6 · Muse Wonder 161.7 · Muse Spark Open 155.1
- Lowest priceMuse Spark OpenMuse Spark Open $2.00 · GPT-5.6 Sol $8.00 · Muse Wonder $8.00 per 1M tokens (3:1 blend)
- Longest contextAbout the sameGPT-5.6 Sol 1,050,000 · Muse Spark Open 1,048,576 · Muse Wonder 1,048,576 tokens
- Widest inputsMuse WonderGPT-5.6 Sol: Text, Images, PDFs · Muse Spark Open: Text, Images, Audio, Video · Muse Wonder: Text, Images, PDFs, Audio, Video
- Self-hostingMuse Spark OpenPublishes downloadable weights (Muse Model License)
| Measure | Weight | GPT-5.6 Sol | Muse Spark Open | Muse Wonder |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 92 | 83 | 91 |
| Price | 25% | 7 | 34 | 7 |
| Inputs & features | 15% | 80 | 80 | 100 |
| Context window | 10% | 61 | 61 | 61 |
| Overall | 100% | 66/100 | 68/100 | 68/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-5.6 SolOpenAI | Muse Spark OpenMeta | Muse WonderMeta |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 162.6 (best) | 155.1 | 161.7 |
| ECI rank | #12 of 165 (best) | #39 of 165 | #13 of 165 |
| GPQA DiamondGraduate-level science questions | 93.5% (best) | 88.6% | — |
| FrontierMath Tiers 1–3Research-level mathematics | 89.1% (best) | 69.8% | 82.1% |
| OTIS Mock AIME 2024–2025Competition mathematics | 100% (best) | 98.1% | 99.4% |
| SimpleQA VerifiedShort factual questions | 69.7% (best) | 56.6% | — |
| Price per million tokens | |||
| Input | $4.00 | $1.25 (best) | $4.00 |
| Output | $20.00 | $4.25 (best) | $20.00 |
| Cached input | $0.40 | — | $0.20 (best) |
| Blended (3:1) | $8.00 | $2.00 (best) | $8.00 |
| Long-context rate | Over 272K: $8.00 / $30.00 | Same rate | Same rate |
| Price source | Official OpenAI API | Median of 16 providers | Official Meta API |
| Limits | |||
| Context window | 1,050,000 tokens (best) | 1,048,576 tokens | 1,048,576 tokens |
| Max output | 128,000 tokens | 131,072 tokens (best) | 131,072 tokens (best) |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | No | Yes |
| Audio | No | Yes | Yes |
| Video | No | Yes | Yes |
| Reasoning | Yeslow · medium · high · xhigh · max | Yes | Yesminimal · low · medium · high · xhigh · max |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | Yes |
| Availability | |||
| Weights | Proprietary | OpenMuse Model License | Proprietary |
| API model ID | gpt-5.6-sol | — | muse-wonder-1.0 |
| API providers | 49 (best) | 16 | 9 |
| Released | Jul 9, 2026 | Oct 15, 2026 | Oct 12, 2026 |
| Knowledge cutoff | Feb 16, 2026 | Jan 4, 2026 | — |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-5.6 Sol$80.00
- Muse Spark Open$21.00
- Muse Wonder$80.00
Which should you choose?
Which is better: GPT-5.6 Sol, Muse Spark Open or Muse Wonder?
It is close. Our weighted score puts them within a point (Muse Wonder 68/100, Muse Spark Open 68/100, GPT-5.6 Sol 66/100), so choose by what matters most for your work: GPT-5.6 Sol for raw capability and Muse Spark Open on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, GPT-5.6 Sol, Muse Spark Open or Muse Wonder?
Muse Spark Open is cheaper at $1.25 input / $4.25 output per million tokens (median across 16 API providers). GPT-5.6 Sol costs $4.00 input / $20.00 output per million tokens (official OpenAI API price); Muse Wonder costs $4.00 input / $20.00 output per million tokens (official Meta API price). At a typical mix of three input tokens to one output token, that is $2.00 per million tokens for Muse Spark Open versus $8.00 for GPT-5.6 Sol (4× as much) and $8.00 for Muse Wonder (4× as much).
Which scores higher on benchmarks?
GPT-5.6 Sol scores higher on the Capabilities Index (ECI): GPT-5.6 Sol 162.6 (#12 of 165), Muse Wonder 161.7 (#13 of 165) and Muse Spark Open 155.1 (#39 of 165). The confidence ranges of the top two overlap (159.6–166.2 vs 159.2–164.6), so treat the gap as small. On individual benchmarks: FrontierMath Tiers 1–3 — GPT-5.6 Sol 89.1%, Muse Wonder 82.1%, Muse Spark Open 69.8%; OTIS Mock AIME 2024–2025 — GPT-5.6 Sol 100%, Muse Wonder 99.4%, Muse Spark Open 98.1%.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-5.6 Sol, Muse Spark Open and Muse Wonder yet, so there is no like-for-like coding score. On overall capability, GPT-5.6 Sol leads, which tends to carry over to coding, but test on your own codebase. All three support tool calling for agent workflows.
Which has the bigger context window?
Their context windows are effectively the same size: GPT-5.6 Sol 1,050,000, Muse Spark Open 1,048,576 and Muse Wonder 1,048,576 tokens. Maximum output per response: GPT-5.6 Sol up to 128,000, Muse Spark Open up to 131,072, Muse Wonder up to 131,072 tokens.
Which can read images, PDFs, audio or video?
GPT-5.6 Sol accepts text, images and PDFs; Muse Spark Open accepts text, images, audio and video; Muse Wonder accepts text, images, PDFs, audio and video. Muse Wonder handles the widest range of inputs.
Are any of these open source?
Muse Spark Open publishes its weights (Muse Model License) and can be self-hosted; GPT-5.6 Sol and Muse Wonder is proprietary.
Which is newer?
Muse Spark Open is the newest, released Oct 15, 2026. Muse Wonder came out Oct 12, 2026; GPT-5.6 Sol came out Jul 9, 2026. Knowledge cutoff: GPT-5.6 Sol Feb 16, 2026, Muse Spark Open Jan 4, 2026.
How do you decide the winner?
Each model gets a 0–100 score on capability (50%, independent benchmark results); price (25%, blended price per million tokens (3 input : 1 output), log scale); inputs & features (15%, image, PDF, audio and video input, tool calling, structured output and reasoning); context window (10%, maximum tokens per request, log scale). Dimensions missing for any model are dropped and the remaining weights rescaled, so every model is judged on the same evidence. Specs and prices come from public model listings and the labs’ own API pages; capability scores come from independent benchmark runs. Data updated Nov 2, 2026.
