Claude Sonnet 5.5 vs Muse Spark 1.2 vs Gemini 4 Argon
Too close to call on our weighted score (Gemini 4 Argon 74, Claude Sonnet 5.5 72, Muse Spark 1.2 71). The right pick depends on what you value most.
AnthropicClaude Sonnet 5.5
72/100- ECI166.7
- Price$2.00 / $10.00
- Context1M
MetaMuse Spark 1.2
71/100- ECI155.2
- Price$1.25 / $4.25
- Context1.05M
GoogleGemini 4 Argon
74/100- ECI166.1
- Price$2.00 / $10.00
- Context1.05M
Too close to call
It is close. Our weighted score puts them within 3 points (Gemini 4 Argon 74/100, Claude Sonnet 5.5 72/100, Muse Spark 1.2 71/100), so choose by what matters most for your work: Claude Sonnet 5.5 for raw capability and Muse Spark 1.2 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
- CapabilityClaude Sonnet 5.5Capabilities Index (ECI): Claude Sonnet 5.5 166.7 · Gemini 4 Argon 166.1 · Muse Spark 1.2 155.2
- Lowest priceMuse Spark 1.2Muse Spark 1.2 $2.00 · Claude Sonnet 5.5 $4.00 · Gemini 4 Argon $4.00 per 1M tokens (3:1 blend)
- Longest contextMuse Spark 1.2 and Gemini 4 ArgonMuse Spark 1.2 1,048,576 · Gemini 4 Argon 1,048,576 · Claude Sonnet 5.5 1,000,000 tokens
- Widest inputsMuse Spark 1.2 and Gemini 4 ArgonClaude Sonnet 5.5: Text, Images, PDFs · Muse Spark 1.2: Text, Images, PDFs, Audio, Video · Gemini 4 Argon: Text, Images, PDFs, Audio, Video
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Claude Sonnet 5.5 | Muse Spark 1.2 | Gemini 4 Argon |
|---|---|---|---|---|
| CapabilityCapabilities Index (ECI) | 50% | 97 | 83 | 96 |
| Price | 25% | 20 | 34 | 20 |
| Inputs & features | 15% | 80 | 100 | 100 |
| Context window | 10% | 60 | 61 | 61 |
| Overall | 100% | 72/100 | 71/100 | 74/100 |
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | Claude Sonnet 5.5Anthropic | Muse Spark 1.2Meta | Gemini 4 ArgonGoogle |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 166.7 (best) | 155.2 | 166.1 |
| ECI rank | #5 of 165 (best) | #38 of 165 | #7 of 165 |
| GPQA DiamondGraduate-level science questions | 95.6% | — | 96.4% (best) |
| FrontierMath Tiers 1–3Research-level mathematics | 88.8% (best) | — | 86.0% |
| OTIS Mock AIME 2024–2025Competition mathematics | 100% | — | 100% |
| SimpleQA VerifiedShort factual questions | 46.5% | 60.3% | 76.0% (best) |
| Price per million tokens | |||
| Input | $2.00 | $1.25 (best) | $2.00 |
| Output | $10.00 | $4.25 (best) | $10.00 |
| Cached input | $0.10 (best) | $0.15 | $0.10 (best) |
| Blended (3:1) | $4.00 | $2.00 (best) | $4.00 |
| Long-context rate | Same rate | Same rate | Same rate |
| Price source | Official Anthropic API | Official Meta API | Official Google API |
| Limits | |||
| Context window | 1,000,000 tokens | 1,048,576 tokens (best) | 1,048,576 tokens (best) |
| Max output | 128,000 tokens | 131,072 tokens (best) | 65,536 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | Yes |
| PDFs | Yes | Yes | Yes |
| Audio | No | Yes | Yes |
| Video | No | Yes | Yes |
| Reasoning | Yeslow · medium · high · xhigh · max | Yesminimal · low · medium · high · xhigh | Yeslow · medium · high |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | Yes | Yes |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | claude-sonnet-5-5 | muse-spark-1.2 | gemini-4-argon |
| API providers | 34 (best) | 18 | 24 |
| Released | Sep 28, 2026 | Aug 5, 2026 | Oct 13, 2026 |
| Knowledge cutoff | Jun 2026 | — | Mar 2026 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Claude Sonnet 5.5$40.00
- Muse Spark 1.2$21.00
- Gemini 4 Argon$40.00
Which should you choose?
Which is better: Claude Sonnet 5.5, Muse Spark 1.2 or Gemini 4 Argon?
It is close. Our weighted score puts them within 3 points (Gemini 4 Argon 74/100, Claude Sonnet 5.5 72/100, Muse Spark 1.2 71/100), so choose by what matters most for your work: Claude Sonnet 5.5 for raw capability and Muse Spark 1.2 on price. The score weighs capability 50%, price 25%, inputs & features 15%, context window 10%.
Which is cheaper, Claude Sonnet 5.5, Muse Spark 1.2 or Gemini 4 Argon?
Muse Spark 1.2 is cheaper at $1.25 input / $4.25 output per million tokens (official Meta API price). Claude Sonnet 5.5 costs $2.00 input / $10.00 output per million tokens (official Anthropic API price); Gemini 4 Argon costs $2.00 input / $10.00 output per million tokens (official Google API price). At a typical mix of three input tokens to one output token, that is $2.00 per million tokens for Muse Spark 1.2 versus $4.00 for Claude Sonnet 5.5 (2× as much) and $4.00 for Gemini 4 Argon (2× as much).
Which scores higher on benchmarks?
Claude Sonnet 5.5 scores higher on the Capabilities Index (ECI): Claude Sonnet 5.5 166.7 (#5 of 165), Gemini 4 Argon 166.1 (#7 of 165) and Muse Spark 1.2 155.2 (#38 of 165). The confidence ranges of the top two overlap (163.6–171.3 vs 163.1–170.3), so treat the gap as small. On individual benchmarks: SimpleQA Verified — Gemini 4 Argon 76.0%, Muse Spark 1.2 60.3%, Claude Sonnet 5.5 46.5%.
Which is better for coding?
There are no published SWE-bench Verified results for Claude Sonnet 5.5, Muse Spark 1.2 and Gemini 4 Argon yet, so there is no like-for-like coding score. On overall capability, Claude Sonnet 5.5 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?
Muse Spark 1.2 and Gemini 4 Argon have the largest context windows (1,048,576 and 1,048,576 tokens), against 1,000,000 for Claude Sonnet 5.5. Maximum output per response: Claude Sonnet 5.5 up to 128,000, Muse Spark 1.2 up to 131,072, Gemini 4 Argon up to 65,536 tokens.
Which can read images, PDFs, audio or video?
Claude Sonnet 5.5 accepts text, images and PDFs; Muse Spark 1.2 accepts text, images, PDFs, audio and video; Gemini 4 Argon accepts text, images, PDFs, audio and video. Muse Spark 1.2 handles the widest range of inputs.
Are any of these open source?
No. Claude Sonnet 5.5, Muse Spark 1.2 and Gemini 4 Argon are proprietary and only available through APIs and apps.
Which is newer?
Gemini 4 Argon is the newest, released Oct 13, 2026. Claude Sonnet 5.5 came out Sep 28, 2026; Muse Spark 1.2 came out Aug 5, 2026. Knowledge cutoff: Claude Sonnet 5.5 Jun 2026, Gemini 4 Argon Mar 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.
