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Model comparison · Updated 10 Oct 2026

Claude Opus 5 vs GPT-5.5

Claude Opus 5 and GPT-5.5 cost the same on input, $5.00 per 1M tokens. GPT-5.5 has the larger context window (1.05M against 1M tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $4,500 a month for Claude Opus 5 and $4,950 for GPT-5.5.

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ModelsAtlas. “Claude Opus 5 vs GPT-5.5”. Retrieved 10 Oct 2026. https://modelsatlas.com/compare/anthropic/claude-opus-5/vs/openai/gpt-5-5

Model A

Claude Opus 5

by Anthropic · weights not marked open · GRIDF5

Input / 1M
$5.00
asserted Vendor states
Source
docs.anthropic.com/en/docs/about-claude/pricing
Retrieved
17 Aug 2026
Output / 1M$25.00
Context1M
vs

Model B

GPT-5.5

by OpenAI · weights not marked open · GRIDF6

Input / 1M
$5.00
observed We measured
Source
Our catalogue
Retrieved
17 Aug 2026
Output / 1M$30.00
Context1.05M

Key numbers

Standard tier · highlighted = better

Claude Opus 5
GPT-5.5
Input / 1M tokens
$5.00
$5.00
Output / 1M tokens
$25.00
$30.00
Batch input / output
$2.50 / $12.50
$2.50 / $15.00
Context window
1,000,000
1,050,000
Input types
Not disclosed
Not disclosed
Weights
Not marked open
Not marked open
Tiers listed
batch, standard
batch, standard
Prices checked
2026-10-10
2026-08-17

What it costs for real workloads

Monthly, standard tier, 30 days

Support chatbot10k chats/day · 1.5k in, 300 out
$4,500/mo
$4,950/mo
RAG over documents2k queries/day · 12k in, 500 out
$4,350/mo
$4,500/mo
Coding agent300 tasks/day · 60k in, 8k out
$4,500/mo
$4,860/mo

Claude Opus 5   GPT-5.5 · Derived from the standard-tier prices above, input and output tokens per request as stated, 30 days. Excludes caching discounts and batch. Try your own numbers.

On the atlas

Price band (A–H) × context band (1–6)

1 square apart. GPT-5.5 (F6) sits 1 context band larger than Claude Opus 5 (F5).

Same square as Claude Opus 5: Claude Sonnet 4.5 ($3.00), Claude Sonnet 4.6 ($3.00), Claude Opus 5.5 ($4.00). Open F5 · Open F6

AFreeB<$0.10C$0.10–0.30D$0.30–1E$1–3F$3–10G$10–30H$30+1<32K232–128K3128–256K4256K–1M51M6>1MINPUT PRICE PER 1M TOKENS →CONTEXT WINDOW ↑ · position within a square follows the real valueClaude Opus 4.6 · F5Claude Opus 4.7 · F5Claude Opus 4.8 · F5Claude Opus 5.5 · F5Qwen3.8 Max Prime · F5Claude Sonnet 4.5 · F5Claude Opus 5Claude Opus 5GPT-5.5GPT-5.5
Claude Opus 5GPT-5.5Nearest neighboursOpen weights
View the map as a table (2 squares)
SquarePrice bandContext bandModels
GRIDF5$3–101MClaude Opus 5, Claude Opus 4.6, Claude Opus 4.7, Claude Opus 4.8, Claude Opus 5.5, Qwen3.8 Max Prime, Claude Sonnet 4.5
GRIDF6$3–10>1MGPT-5.5

Capabilities side by side

Only what our records list

Claude Opus 5
GPT-5.5
Vision input
Not disclosed
Not disclosed
Audio input
Not disclosed
Not disclosed
Open weights
Not marked open
Not marked open
Batch tier
Supported
Supported
Free tier
Not listed
Not listed
Thinking tier
Not listed
Not listed

Neither record lists input types, so we do not claim any.

Which should you choose?

Editorial

Choose Claude Opus 5 if…

  • output dominates your bill: $25.00 per 1M output against $30.00

Choose GPT-5.5 if…

  • your prompts are long: it takes 1,050,000 tokens against 1,000,000

Each reason is a fact from the tables above. Picking between them is our judgement, and we do not benchmark quality: price and context are what we can measure, so test both on your own prompts before you commit.

Questions

Is Claude Opus 5 better than GPT-5.5?
We do not benchmark quality, so we cannot say. On the recorded numbers: Claude Opus 5 and GPT-5.5 cost the same on input, $5.00 per 1M tokens. GPT-5.5 has the larger context window (1.05M against 1M tokens). For a support chatbot at 10,000 chats a day, the standard-tier bill is about $4,500 a month for Claude Opus 5 and $4,950 for GPT-5.5. Which is better for you depends on your task; test both on your own prompts.
Which is cheaper, Claude Opus 5 or GPT-5.5?
They cost the same on input, $5.00 per 1M tokens. Output is $25.00 for Claude Opus 5 and $30.00 for GPT-5.5.
How much does each cost per 1M tokens?
Claude Opus 5: $5.00 input and $25.00 output. GPT-5.5: $5.00 input and $30.00 output. Standard tier, USD.
Which has the larger context window?
GPT-5.5, with 1,050,000 tokens. Claude Opus 5 has 1,000,000 tokens.
Do both offer batch pricing?
Claude Opus 5 lists a batch tier, at 50% of its standard price. GPT-5.5 lists a batch tier, at 50% of its standard price.
Can both read images or audio?
Input types recorded for Claude Opus 5: none recorded. For GPT-5.5: none recorded. Where a record lists none we say so rather than guess; check each vendor's documentation before relying on a capability.
Is either model open-weight?
Claude Opus 5: not marked open-weight in our records. GPT-5.5: not marked open-weight in our records.
What would each cost for a support chatbot?
At 10,000 chats a day, 1,500 input and 300 output tokens each, 30 days, standard tier: about $4,500 a month for Claude Opus 5 and $4,950 for GPT-5.5. This is our calculation from the listed prices, not a quote.

About the two models

Claude Opus 5

By Anthropic. $5.00 input and $25.00 output per 1M tokens, 1M context, atlas square F5. Tiers listed: batch, standard.

Full specs & pricing →

GPT-5.5

By OpenAI. $5.00 input and $30.00 output per 1M tokens, 1.05M context, atlas square F6. Tiers listed: batch, standard.

Full specs & pricing →

Keep going in your AI

Opens with this page as the source. We add nothing else to the prompt.