Devstral Medium vs Morph V3 Fast vs o3-deep-research
o3-deep-research comes out ahead, 49 to 25 and 15 on our weighted score, though Morph V3 Fast is 18× cheaper per token.
Mistral AIDevstral Medium
25/100- ECI—
- Price—
- Context128K
Morph
Morph V3 Fast
15/100- ECI—
- Price$0.80 / $1.20
- Context262K
- Our pick
OpenAIo3-deep-research
49/100- ECI—
- Price$9.00 / $36.00
- Context200K
o3-deep-research is our pick
o3-deep-research is the better all-round choice, scoring 49/100 against Devstral Medium (25) and Morph V3 Fast (15). It leads on inputs & features. Morph V3 Fast wins on context window. 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 priceMorph V3 FastMorph V3 Fast $0.90 · o3-deep-research $15.75 per 1M tokens (3:1 blend) · Devstral Medium unpriced
- Longest contextMorph V3 FastMorph V3 Fast 262,144 · o3-deep-research 200,000 · Devstral Medium 128,000 tokens
- Widest inputso3-deep-researchDevstral Medium: Text · Morph V3 Fast: Text · o3-deep-research: Text, Images
- Self-hostingNo open weightsAll three are available only through APIs
| Measure | Weight | Devstral Medium | Morph V3 Fast | o3-deep-research |
|---|---|---|---|---|
| Inputs & features | 60% | 25 | 0 | 60 |
| Context window | 40% | 24 | 37 | 32 |
| Overall | 100% | 25/100 | 15/100 | 49/100 |
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 | Devstral MediumMistral AI | Morph V3 FastMorph | o3-deep-researchOpenAI |
|---|---|---|---|
| Capability | |||
| Capabilities Index (ECI) | — | — | — |
| ECI rank | — | — | — |
| Price per million tokens | |||
| Input | — | $0.80 (best) | $9.00 |
| Output | — | $1.20 (best) | $36.00 |
| Cached input | — | — | — |
| Blended (3:1) | — | $0.90 (best) | $15.75 |
| Long-context rate | — | Same rate | Same rate |
| Price source | — | Median of 5 providers | Median of 1 providers |
| Limits | |||
| Context window | 128,000 tokens | 262,144 tokens (best) | 200,000 tokens |
| Max output | 128,000 tokens | 131,072 tokens (best) | 100,000 tokens |
| Inputs and features | |||
| Text | Yes | Yes | Yes |
| Images | No | No | Yes |
| PDFs | No | No | No |
| Audio | No | No | No |
| Video | No | No | No |
| Reasoning | No | No | Yes |
| Tool calling | Yes | No | Yes |
| Structured output | No | No | No |
| Availability | |||
| Weights | Proprietary | Proprietary | Proprietary |
| API model ID | — | — | — |
| API providers | — | 5 (best) | 1 |
| Released | Jul 10, 2025 | Jul 7, 2025 | Jun 26, 2025 |
| Knowledge cutoff | May 2025 | — | May 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- Devstral Medium—
- Morph V3 Fast$10.40
- o3-deep-research$162.00
Which should you choose?
Which is better: Devstral Medium, Morph V3 Fast or o3-deep-research?
o3-deep-research is the better all-round choice, scoring 49/100 against Devstral Medium (25) and Morph V3 Fast (15). It leads on inputs & features. Morph V3 Fast wins on context window. 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, Devstral Medium, Morph V3 Fast or o3-deep-research?
Morph V3 Fast is cheaper at $0.80 input / $1.20 output per million tokens (median across 5 API providers). o3-deep-research costs $9.00 input / $36.00 output per million tokens (median across 1 API provider). At a typical mix of three input tokens to one output token, that is $0.90 per million tokens for Morph V3 Fast versus $15.75 for o3-deep-research (18× as much). Devstral Medium has no published per-token price.
Which scores higher on benchmarks?
There is no independent benchmark that covers all three models yet. Devstral Medium has not been scored yet, Morph V3 Fast has not been scored yet and o3-deep-research has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for Devstral Medium, Morph V3 Fast and o3-deep-research yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Note that Morph V3 Fast does not support tool calling, which most coding agents need.
Which has the bigger context window?
Morph V3 Fast has the largest context window at 262,144 tokens, against 200,000 for o3-deep-research and 128,000 for Devstral Medium. Maximum output per response: Devstral Medium up to 128,000, Morph V3 Fast up to 131,072, o3-deep-research up to 100,000 tokens.
Which can read images, PDFs, audio or video?
Devstral Medium accepts text; Morph V3 Fast accepts text; o3-deep-research accepts text and images. o3-deep-research handles the widest range of inputs.
Are any of these open source?
No. Devstral Medium, Morph V3 Fast and o3-deep-research are proprietary and only available through APIs and apps.
Which is newer?
Devstral Medium is the newest, released Jul 10, 2025. Morph V3 Fast came out Jul 7, 2025; o3-deep-research came out Jun 26, 2025. Knowledge cutoff: Devstral Medium May 2025, o3-deep-research May 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 Nov 2, 2026.
