GPT-5.5
openai/gpt-5.5
latest frontier model for general complex work.
cmd --model gpt-5.5
Intelligence index
56.3
Output speed
not yet scored
Input
$5 /M
Output
$30 /M
Cache read
$0.50 /M
Agent-loop cost
$1.85 /M in
Context window
400K tokens
Released
April 23, 2026
Modalities
→
vs. the lineup
GPT-5.5 beside its stablemates and nearest rivals. The ◆ marks the best value in each column across every row shown.
pin a rival:
| Model | Intelligence | Coding | Speed | Input $/M | Output $/M | Blended $/M | Context |
|---|---|---|---|---|---|---|---|
| GPT-5.6 Sol | 60.9◆ | 77.4◆ | 69.6◆ | $5◆ | $30◆ | $11.25◆ | 1.05M◆ |
| GPT-5.6 Terra | 56.6◆ | 76.7◆ | 112.8◆ | $2◆ | $12◆ | $4.50◆ | 1.05M◆ |
| GPT-5.5 ◆ | 56.3◆ | 74.9◆ | —◆ | $5◆ | $30◆ | $11.25◆ | 400K◆ |
| GPT-5.4 | 53.1◆ | 71.1◆ | —◆ | $2.50◆ | $15◆ | $5.63◆ | 400K◆ |
| GPT-5.6 Luna | 52.3◆ | 71.4◆ | 124.1◆ | $0.20◆ | $1.20◆ | $0.45◆ | 1.05M◆ |
| GPT-6 Astra | —◆ | —◆ | —◆ | $10◆ | $50◆ | $20◆ | 1.05M◆ |
| DeepSeek V4 Pro (latest)pinned | 53.2◆ | 68.8◆ | 61◆ | $0.66◆ | $1.98◆ | $0.99◆ | 1M◆ |
| DeepSeek V4 Flash (latest)pinned | 52◆ | 69.1◆ | 129◆ | $0.22◆ | $0.66◆ | $0.33◆ | 1M◆ |
coding performance
The Intelligence Index and its sub-scores, ranked against every scored model in the catalog. A metric that has not been measured for GPT-5.5 has been left empty.
Coding Index
74.9
#8 of 46 scored
Terminal-Bench
84.3
#10 of 46 scored
Intelligence Index
56.3
#13 of 52 scored
Long-context reasoning
79
reasoning across a long context
SciCode
56.1
scientific coding
GPQA Diamond
93.5
graduate-level QA
usage calculator
How far a month of credits goes on GPT-5.5.
GPT-5.5 runs on Pro and up — from $20/mo.
Input tokensfresh prompt
800Output tokensmodel reply
180Cache read tokensre-read context
50Kcost / request $0.034 · in $5 · out $30 · cache $0.50 per M
fresh input 12%output 16%cache reads 73%
Requests / 30 days
581
$20 credits ÷ $0.034 per request
~116 quick fixes~23 bug fixes~4 feature PRs
what real work costs
Real coding tasks priced end to end on GPT-5.5, from a quick lookup to a full-repo agent run.
One agent task
$0.65
180K in at 75% cache hit, 12K out
What you pay
$3.40 /M
all-in across every token that task touched
Sticker input
$5 /M
cache reads bill at $0.50 /M instead
| Task | Tokens in · out | GPT-5.5 | Claude Opus 5 | Claude Haiku 4.5 |
|---|---|---|---|---|
| Quick lookup / one-liner | 8K · 1K | $0.04 | $0.03 | $0.0065 |
| Review a 500-line PR | 60K · 4K | $0.23 | $0.21 | $0.04 |
| Fix a bug (agent loop) | 180K · 12K | $0.65 | $0.59 | $0.12 |
| Refactor a module | 320K · 20K | $1.16 | $1.06 | $0.21 |
| Full-repo agent run | 900K · 45K | $2.69 | $2.47 | $0.49 |
frequently asked
How much does GPT-5.5 cost?
$5/M input and $30/M output, cache reads $0.50/M. In an agent loop most input is cache-read, so the effective input rate is about $1.85/M.Which plan do I need?
Available on Pro and above.
How do I switch to it?
Run
cmd --model gpt-5.5, or type /model in a session and pick it. You can switch mid-session without losing context.Ship code that matches your taste
Command Code is the AI coding agent that continuously learns your taste. Start for $1.
Benchmarks from Artificial Analysis (v4.1)commandcode.ai/models/gpt-5-5