o4-mini vs o4-mini-deep-research vs solar-mini
o4-mini comes out ahead, 55 to 49 and 15 on our weighted score, though solar-mini is 13× cheaper per token.
- Our pick
OpenAIo4-mini
55/100- ECI145.6
- Price$1.10 / $4.40
- Context200K
- OpenAI
o4-mini-deep-research
49/100- ECI—
- Price—
- Context200K
Upstage
solar-mini
15/100- ECI—
- Price$0.15 / $0.15
- Context33K
o4-mini is our pick
o4-mini is the better all-round choice, scoring 55/100 against o4-mini-deep-research (49) and solar-mini (15). It leads on inputs & features. The score weighs inputs & features 60%, context window 40%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
- CapabilityNot enough dataNo independent benchmark covers every model here yet
- Lowest pricesolar-minisolar-mini $0.15 · o4-mini $1.93 per 1M tokens (3:1 blend) · o4-mini-deep-research unpriced
- Longest contexto4-mini and o4-mini-deep-researcho4-mini 200,000 · o4-mini-deep-research 200,000 · solar-mini 32,768 tokens
- Widest inputso4-mini and o4-mini-deep-researcho4-mini: Text, Images · o4-mini-deep-research: Text, Images · solar-mini: Text
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | o4-mini | o4-mini-deep-research | solar-mini |
|---|---|---|---|---|
| Inputs & features | 60% | 70 | 60 | 25 |
| Context window | 40% | 32 | 32 | 0 |
| Overall | 100% | 55/100 | 49/100 | 15/100 |
Left out because at least one model lacks the data: capability and price. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | o4-miniOpenAI | o4-mini-deep-researchOpenAI | solar-miniUpstage |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | 145.6 | — | — |
| ECI rank | #76 of 148 | — | — |
| GPQA DiamondGraduate-level science questions | 79.6% | — | — |
| FrontierMath Tiers 1–3Research-level mathematics | 36.1% | — | — |
| OTIS Mock AIME 2024–2025Competition mathematics | 81.7% | — | — |
| SimpleQA VerifiedShort factual questions | 19.6% | — | — |
| Price per million tokens | |||
| Input | $1.10 | — | $0.15 (best) |
| Output | $4.40 | — | $0.15 (best) |
| Cached input | $0.275 | — | — |
| Blended (3:1) | $1.93 | — | $0.15 (best) |
| Long-context rate | Same rate | — | Same rate |
| Price source | Official OpenAI API | — | Official Upstage API |
| Limits | |||
| Context window | 200,000 tokens (best) | 200,000 tokens (best) | 32,768 tokens |
| Max output | 100,000 tokens (best) | 100,000 tokens (best) | 4,096 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | Yes | Yes | No |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | Yeslow · medium · high | Yes | No |
| Tool calling | Yes | Yes | Yes |
| Structured output | Yes | No | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | o4-mini | — | solar-mini |
| API providers | 19 (best) | — | 1 |
| Released | Apr 16, 2025 | Jun 26, 2024 | Jun 12, 2024 |
| Knowledge cutoff | May 2024 | May 2024 | Sep 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- o4-mini$19.80
- o4-mini-deep-research—
- solar-mini$1.80
Which should you choose?
Which is better: o4-mini, o4-mini-deep-research or solar-mini?
o4-mini is the better all-round choice, scoring 55/100 against o4-mini-deep-research (49) and solar-mini (15). It leads on inputs & features. The score weighs inputs & features 60%, context window 40%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, o4-mini, o4-mini-deep-research or solar-mini?
solar-mini is cheaper at $0.15 input / $0.15 output per million tokens (official Upstage API price). o4-mini costs $1.10 input / $4.40 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $0.15 per million tokens for solar-mini versus $1.93 for o4-mini (13× as much). o4-mini-deep-research has no published per-token price.
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. o4-mini has an ECI of 145.6, o4-mini-deep-research has not been scored yet and solar-mini has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for o4-mini, o4-mini-deep-research and solar-mini yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. All three support tool calling for agent workflows.
Which has the bigger context window?
o4-mini and o4-mini-deep-research have the largest context windows (200,000 and 200,000 tokens), against 32,768 for solar-mini. Maximum output per response: o4-mini up to 100,000, o4-mini-deep-research up to 100,000, solar-mini up to 4,096 tokens.
Which can read images, PDFs, audio or video?
o4-mini accepts text and images; o4-mini-deep-research accepts text and images; solar-mini accepts text. o4-mini handles the widest range of inputs.
Are any of these open source?
No. o4-mini, o4-mini-deep-research and solar-mini are proprietary and only available through APIs and apps.
Which is newer?
o4-mini is the newest, released Apr 16, 2025. o4-mini-deep-research came out Jun 26, 2024; solar-mini came out Jun 12, 2024. Knowledge cutoff: o4-mini May 2024, o4-mini-deep-research May 2024, solar-mini Sep 2024.
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 Oct 4, 2026.
