Claude Opus 5.5
Anthropic's 22 Sep 2026 flagship and the top model on Artificial Analysis Intelligence Index v4.3.2 at 58 (max effort, adaptive reasoning, with fallback) — five points clear of Claude Fable 5.1 and GPT-6 Astra at 53 on the same index, and first on the LMArena text board (1509, high effort, 25 Sep snapshot), though that interval is wide enough that it is not statistically separated from ranks two to four. Priced at $4/$20 per 1M tokens, 20% below Opus 5 and 60% below Fable 5.1 per token; Anthropic says it requires less compute to serve and that the price reflects it. Cache reads are $0.20, 0.05x the input rate, and the Batch API halves both rates. 1M context at standard pricing with no long-context surcharge, 128K maximum output (300K on the Batch API with a beta header). Thinking is adaptive and always on, with a default effort of medium. Cost per task depends heavily on the effort dial: Artificial Analysis measures $5.98 per Index task at max, $3.46 at xhigh, $1.82 at high and $1.34 at medium (scores 58/56/54/51) — so high effort already out-scores Fable 5.1 at max (53, $7.63) for under a quarter of the cost. The catch is verbosity: 260M output tokens across the Index against a 81M median, flagged 'very verbose'. Fast mode (research preview, Claude API only) is $8/$40. Anthropic's own benchmark table (vendor-run, with production safeguards on) has Terminal-Bench 4.0 at 66.4 against Fable 5.1's 55.8 and Astra's 57.9.
1M
tokens
128K
tokens
$4
per 1M tokens
$20
per 1M tokens
—
tokens/sec
Sep 2026
2026-09-22
$12.00
per 1M tokens
8.3
quality per $
Capabilities
Benchmarks
Price vs Quality
Context Window in Context
- ▸ Claude Opus 5.51M
- GPT-4.11M
- Gemini 2.5 Pro1M
- Gemini 2.0 Flash1M
- Llama 4 Maverick1M
- GPT-5.51M
- GPT-5.5 Pro1M
- Claude Opus 4.71M
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curl https://api.swfte.com/agents/v2/gateway/chat/completions \
-H "Authorization: Bearer $SWFTE_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "anthropic:claude-opus-5-5",
"messages": [{"role": "user", "content": "Hello"}]
}'About Claude Opus 5.5
Claude Opus 5.5 is a flagship AI model by Anthropic, released on September 22, 2026. It supports a context window of 1000K tokens and can generate up to 128K output tokens.
At $4 per million input tokens and $20 per million output tokens, its blended cost of $12.00/1M tokens places it in the premium pricing tier. Its value score of 8.3 reflects the balance of quality and cost.
Using Claude Opus 5.5 with Swfte
Access Claude Opus 5.5 through Swfte Connect, our unified LLM gateway. Connect gives you a single API for 50+ models, with automatic routing, cost optimization, and fallback handling. You can also try Claude Opus 5.5 in our AI Playground before integrating.