GPT-4 Turbo vs Step 2 (16K)
GPT-4 Turbo comes out ahead, 20 to 11 on our weighted score, though Step 2 (16K) is 47% cheaper per token.
- Our pick
OpenAIGPT-4 Turbo
20/100- ECI—
- Price$10.00 / $30.00
- Context128K
StepFunStep 2 (16K)
11/100- ECI—
- Price$5.21 / $16.44
- Context16K
Add a model
Make it a three-way comparison.
GPT-4 Turbo is our pick
GPT-4 Turbo is the better all-round choice, scoring 20/100 against Step 2 (16K) (11). It leads on inputs & features and context window. Step 2 (16K) wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. 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 priceStep 2 (16K)Step 2 (16K) $8.02 · GPT-4 Turbo $15.00 per 1M tokens (3:1 blend)
- Longest contextGPT-4 TurboGPT-4 Turbo 128,000 · Step 2 (16K) 16,384 tokens
- Widest inputsGPT-4 TurboGPT-4 Turbo: Text, Images · Step 2 (16K): Text
- Self-hostingNo open weightsBoth are available only through APIs
| Measure | Weight | GPT-4 Turbo | Step 2 (16K) |
|---|---|---|---|
| Price | 50% | 0 | 7 |
| Inputs & features | 30% | 50 | 25 |
| Context window | 20% | 24 | 0 |
| Overall | 100% | 20/100 | 11/100 |
Left out because at least one model lacks the data: capability. The remaining weights were rescaled.
Every spec in one table
Highlighted cells lead their row. Dashes mean the data is not published.
| Specification | GPT-4 TurboOpenAI | Step 2 (16K)StepFun |
|---|---|---|
| Capability | ||
| Capabilities Index (ECI) | — | — |
| ECI rank | — | — |
| Price per million tokens | ||
| Input | $10.00 | $5.21 (best) |
| Output | $30.00 | $16.44 (best) |
| Cached input | — | $1.04 |
| Blended (3:1) | $15.00 | $8.02 (best) |
| Long-context rate | Same rate | Same rate |
| Price source | Official OpenAI API | Official StepFun (Global) API |
| Limits | ||
| Context window | 128,000 tokens (best) | 16,384 tokens |
| Max output | 4,096 tokens | 8,192 tokens (best) |
| Inputs and features | ||
| Text | Yes | Yes |
| Images | Yes | No |
| PDFs | No | No |
| Audio | No | No |
| Video | No | No |
| Reasoning | No | No |
| Tool calling | Yes | Yes |
| Structured output | No | No |
| Availability | ||
| Weights | Proprietary | Proprietary |
| API model ID | gpt-4-turbo | step-2-16k |
| API providers | 12 (best) | 1 |
| Released | Nov 6, 2023 | Jan 1, 2025 |
| Knowledge cutoff | Dec 2023 | Jun 2024 |
What would a month cost?
Enter your expected volume in millions of tokens. List prices only; caching and batch discounts would lower these.
- GPT-4 Turbo$160.00
- Step 2 (16K)$84.98
Which should you choose?
Which is better: GPT-4 Turbo or Step 2 (16K)?
GPT-4 Turbo is the better all-round choice, scoring 20/100 against Step 2 (16K) (11). It leads on inputs & features and context window. Step 2 (16K) wins on price. The score weighs price 50%, inputs & features 30%, context window 20%. None of the shared benchmarks cover every model here yet, so capability is left out of this verdict.
Which is cheaper, GPT-4 Turbo or Step 2 (16K)?
Step 2 (16K) is cheaper at $5.21 input / $16.44 output per million tokens (official StepFun (Global) API price). GPT-4 Turbo costs $10.00 input / $30.00 output per million tokens (official OpenAI API price). At a typical mix of three input tokens to one output token, that is $8.02 per million tokens for Step 2 (16K) versus $15.00 for GPT-4 Turbo (1.9× as much).
Which scores higher on benchmarks?
There is no independent benchmark that covers both models yet. GPT-4 Turbo has not been scored yet and Step 2 (16K) has not been scored yet.
Which is better for coding?
There are no published SWE-bench Verified results for GPT-4 Turbo and Step 2 (16K) yet, so there is no like-for-like coding score. Test both on a sample of your own tasks. Both support tool calling for agent workflows.
Which has the bigger context window?
GPT-4 Turbo has the largest context window at 128,000 tokens, against 16,384 for Step 2 (16K). Maximum output per response: GPT-4 Turbo up to 4,096, Step 2 (16K) up to 8,192 tokens.
Which can read images, PDFs, audio or video?
GPT-4 Turbo accepts text and images; Step 2 (16K) accepts text. GPT-4 Turbo handles the widest range of inputs.
Are any of these open source?
No. GPT-4 Turbo and Step 2 (16K) are proprietary and only available through APIs and apps.
Which is newer?
Step 2 (16K) is the newest, released Jan 1, 2025. GPT-4 Turbo came out Nov 6, 2023. Knowledge cutoff: GPT-4 Turbo Dec 2023, Step 2 (16K) Jun 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.
