AllocateGPT-5.5 vs Inkling FP4
On provider list prices, Inkling FP4 costs $1 per million input tokens against $5 for GPT-5.5: 5.0x apart. Output is $4.05 against $30 (7.4x).
GPT-5.5
Inkling FP4Specifications and provider list prices from the Allocate catalog, checked 2026-07-21.
What the numbers say
Take 1,000,000 requests a month at 1,200 input and 350 output tokens each. That workload costs $2,618 a month on Inkling FP4 and $16,500 on GPT-5.5 at list: a gap of $13,883, or 6.3x.
Inkling FP4 reads 512K tokens per request against 400K for GPT-5.5, 1.3x the window. That decides which one can take whole documents without splitting them.
Choose Inkling FP4 for
- The lower list price ($1 in / $4.05 out per M tokens)
- The longer context window (512K vs 400K tokens)
- Open weights you can fine-tune and own
Common questions
Which is cheaper, GPT-5.5 or Inkling FP4?
Inkling FP4, on this workload shape. At list prices it is $1/$4.05 per million tokens in and out against $5/$30 for GPT-5.5. Billed on Allocate: $1.07/$4.33 against $5.35/$32.10.
Which has the bigger context window?
Inkling FP4: 524,288 tokens (512K) against 400,000 (400K) for GPT-5.5.
Can I fine-tune GPT-5.5 or Inkling FP4?
Inkling FP4 publishes open weights (Apache 2.0) and can be fine-tuned on your own data. GPT-5.5 is a closed model served over API; its weights are not available.
Related comparisons
Run the numbers on your workload
Or don’t choose. On Allocate a route name is the contract: point yours at one model today, swap to the other tomorrow, and compare them on your live traffic with per-token metering.