MODEL PROOF
GPT-5.5
TRADE-OFF
A stored alternative has an equal-or-higher score and an equal-or-lower price, with capability losses.
Base context tier shown; inspect the complete context ladder below.
Gemini 4 Argon · Δ score 66.3 points · 29% lower measured price
- 1.1M → 1M context
- Independent LMArena score
- 1,466.9 ± 3.65 · 70,990 votes
- Context window
- 1.05M
- Maximum output
- 128K
- Input modalities
- file, image, text
- Output modalities
- text
- Published input price
- $5.00 / 1M tokens
- Published output price
- $30.00 / 1M tokens
- Pricing kind
- fixed
- Context tiers
- Tiered by context
Inspect complete billing conditions and endpoint terms below.
Price from OpenAI: the cheapest offer that is serving, at standard delivery, with at least 90% of the reference context and at the maker’s precision or better, at its standard rate.
Cheaper right now: $5.63/M at OpenAI — delivery tier (flex) It does not pass the like-for-like test, so it never sets a rank.
Every price dimension · USD per million tokens
| Input | $5.00/M |
|---|---|
| Output | $30.00/M |
| Cached input | $0.500/M |
| Cache write | Unknown/M |
| Cache write 1h | Unknown/M |
| Reasoning | Unknown/M |
| Web search | $0.01/call |
| Batch discount | 50% |
The headline rate does not apply to a long-context workload.
Complete context ladder · 1 tier
| More than 272,000 tokens | $10.00/M in (2×) $45.00/M out $1.00/M cached input Unknown/M cache write |
|---|
Who sells it
The same weights, different shops. Cheapest is not like-for-like when serving precision differs.
7 provider offers · rates, limits and conditions
Rates are USD per million tokens. Endpoint terms can differ even when the quoted price and precision match. A listed parameter is a provider declaration, not a task-success test.
| Seller | Input | Output | Precision | Uptime (1d) |
|---|---|---|---|---|
| OpenAIopenai/flex Endpoint terms
| $2.50 | $15.00 | undeclared | 100.00% |
| Azureazure Endpoint terms
| $5.00 | $30.00 | undeclared | 99.86% |
| OpenAIopenai Endpoint terms
| $5.00 | $30.00 | undeclared | 100.00% |
| Azureazure/us Endpoint terms
| $5.50 | $33.00 | undeclared | 100.00% |
| Azureazure/eu Endpoint terms
| $5.50 | $33.00 | undeclared | 100.00% |
| Amazon Bedrockamazon-bedrock/us-east-1 Endpoint terms
| $5.50 | $33.00 | undeclared | — |
| OpenAIopenai/fast Endpoint terms
| $12.50 | $75.00 | undeclared | — |
Independent scores
| LMArena Elo | 1466.9default |
|---|---|
| LMArena row | gpt-5.5 |
LMArena Elo under CC BY 4.0. Absence of another board is not a score of zero.
Best rankings by task
- Agenticslides #6 1150
- Agenticslides(python pptx) #6 1155
- Pptxslides #6 1157
- Agentichtmlslides #8 1084
- Agenticslides(html) #8 1077
- Agenticgamedev #14 1179
- ASCII art #15 1255
- SVG #16 1234
Per-task Elo and rank from Design Arena, via OpenRouter’s model feed. The rank is the feed’s, and it counts models OpenRouter does not list.
Capability
| Context window | 1M |
|---|---|
| Max output | 128K |
| Input modes | file, image, text |
| Tool use | yes |
| Reasoning | optional |
| Knowledge cutoff | 2025-12-01 |
| Open weights | no |
Provenance
| Price source | openrouter.ai |
|---|---|
| Fetched | 2026-10-21 |
| Quality data | verified |
| Cross-checked | vendor page |
GPT-5.5 is OpenAI’s frontier model designed for complex professional workloads, building on GPT-5.4 with stronger reasoning, higher reliability, and improved token efficiency on hard tasks. It features a 1M+ token...
Questions this page answers
What does GPT-5.5 cost?
$5.00/M in, $30.00/M out in this catalogue, as of the fetch date on this page. That is the API row, not a subscription.
Does GPT-5.5 have an independent quality score?
GPT-5.5 has an LMArena score in this catalogue.
What beats GPT-5.5?
Gemini 4 Argon has an equal-or-higher measured score and an equal-or-lower price, with capability trade-offs.
Does this page use Artificial Analysis scores for GPT-5.5?
No. Artificial Analysis figures are not published here. Quality on this page is LMArena Elo where a score exists; otherwise the row is unrated.
MODEL MONUMENT
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The verdict as one SVG, for a README or a docs page. It states this model's dominance status at the balanced workload on the LMArena lens, with the date it was computed, and it is rebuilt with the catalogue — so it changes when the verdict changes, including to one you would rather it did not.
[](https://undominated.ai/models/openai__gpt-5.5/)<a href="https://undominated.ai/models/openai__gpt-5.5/"><img src="https://undominated.ai/badge/openai__gpt-5.5.svg" alt="GPT-5.5 — Undominated.ai dominance verdict" height="36"></a>Direct file: https://undominated.ai/badge/openai__gpt-5.5.svg — a static SVG, written by scripts/build-badges.mjs on every build, so the copy you embed is never
older than the last deploy.
